chore(version): v0.7.0

CHANGELOG.md

@@ -2,6 +2,19 @@
 All notable changes to this project will be documented in this file. See [conventional commits](https://www.conventionalcommits.org/) for commit guidelines.
 
 - - -
+## [v0.7.0](https://github.com/Ku6epXBOCTuK/easy-png-tools/compare/7bbcec5ff0c72044dcec70d5ba41c513a0eac16b..v0.7.0) - 2026-10-10
+#### Features
+- update dnd tools in pipeline - ([7bbcec5](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/7bbcec5ff0c72044dcec70d5ba41c513a0eac16b)) - Ku6epXBOCTuK
+#### Bug Fixes
+- update drag-n-drop tools - overlay, page scrim - ([dd9cb6d](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/dd9cb6d574181ffa7520adeff5faef5cbbd494ac)) - Ku6epXBOCTuK
+- update dnd tools in pipeline - ([e866975](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/e866975045aebda6353808d419189f6aae986687)) - Ku6epXBOCTuK
+#### Performance Improvements
+- add cache for images - ([5f4c383](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/5f4c3833a199044c875b5b8e3dd8aa52b472f8a5)) - Ku6epXBOCTuK
+#### Refactoring
+- separate logic from schema tool view component - ([b7613e8](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/b7613e8c0ff82469de2585b1572fbae8f5a796fa)) - Ku6epXBOCTuK
+
+- - -
+
 ## [v0.6.0](https://github.com/Ku6epXBOCTuK/easy-png-tools/compare/bac82f8442a8262e757d18f0cc2b5e7fb8291516..v0.6.0) - 2026-10-10
 #### Features
 - flow for multiple files - pipeline, tools - ([bac82f8](https://github.com/Ku6epXBOCTuK/easy-png-tools/commit/bac82f8442a8262e757d18f0cc2b5e7fb8291516)) - Ku6epXBOCTuK

docs/backlog.md

@@ -168,6 +168,14 @@
       форматирование по колонкам??? для hex\bytes\rgba - пример в placeholder
 - [ ] прикрутить кастомный color picker, добавить прозрачность (range?)
 - [ ] обновить страницу kit или сделать storybook
+- [ ] **проверить `cachedDataUrl` (WeakMap-кэш превью) в реальной работе** — GC
+      срабатывает недетерминированно, поэтому освобождение base64-строк (≈1.3×
+      бинарного размера картинки на каждый тайл) не гарантировано своевременно.
+      Проверить на длинной сессии с большими картинками (несколько ранов подряд,
+      смена инструментов): растёт ли heap в DevTools → Memory после повторных
+      ранов и уходит ли после принудительной сборки. Если записи копятся —
+      заменить на ограниченный LRU или явную инвалидацию при
+      `resetForHost`/новом ране (`web/src/lib/core/io.ts`, `cachedDataUrl`)
 - [ ] `PreviewTile`: высота плитки задана только `min-height: clamp(...)`,
       поэтому она не следует за пропорциями результата — широкий результат
       уезжает в узкую полосу, а высокий упирается в `max-height: 100vh`. Нужно,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "easy-png-tools",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "description": "",
   "main": "index.js",
   "scripts": {

web/package.json

@@ -1,7 +1,7 @@
 {
 	"name": "web",
 	"private": true,
-	"version": "0.6.0",
+	"version": "0.7.0",
 	"type": "module",
 	"scripts": {
 		"dev": "vite dev",
@@ -52,6 +52,8 @@
 		"vitest": "^4.1.11"
 	},
 	"dependencies": {
+		"@dnd-kit/dom": "^0.3.2",
+		"@dnd-kit/svelte": "^0.3.2",
 		"@fontsource/ibm-plex-mono": "^5.3.0",
 		"@fontsource/ibm-plex-sans": "^5.3.0",
 		"@lucide/svelte": "^1.33.0",

web/pnpm-lock.yaml

@@ -8,6 +8,12 @@ importers:
 
   .:
     dependencies:
+      '@dnd-kit/dom':
+        specifier: ^0.3.2
+        version: 0.3.2
+      '@dnd-kit/svelte':
+        specifier: ^0.3.2
+        version: 0.3.2(svelte@5.56.9(@typescript-eslint/types@8.67.0))
       '@fontsource/ibm-plex-mono':
         specifier: ^5.3.0
         version: 5.3.0
@@ -196,6 +202,26 @@ packages:
     peerDependencies:
       postcss-selector-parser: ^7.1.1
 
+  '@dnd-kit/abstract@0.3.2':
+    resolution: {integrity: sha512-uvPVK+SZYD6Viddn9M0K0JQdXknuVSxA/EbMlFRanve3P/XTc18oLa5zGftKSGjfQGmuzkZ34E26DSbly1zi3Q==}
+
+  '@dnd-kit/collision@0.3.2':
+    resolution: {integrity: sha512-pNmNSLCI8S9fNQ7QJ3fBCDjiT0sqBhUFcKgmyYaGvGCAU+kq0AP8OWlh0JSisc9k5mFyxmRpmFQcnJpILz/RPA==}
+
+  '@dnd-kit/dom@0.3.2':
+    resolution: {integrity: sha512-cIUAVgt2szQyz6JRy7I+0r+xeyOAGH21Y15hb5bIyHoDEaZBvIDH+OOlD9eoLjCbsxDLN9WloU2CBi3OE6LYDg==}
+
+  '@dnd-kit/geometry@0.3.2':
+    resolution: {integrity: sha512-3UBPuIS7E3oGiHxOE8h810QA+0pnrnCtGxl4Os1z3yy5YkC/BEYGY+TxWPTQaY1/OMV7GCX7ZNMlama2QN3n3w==}
+
+  '@dnd-kit/state@0.3.2':
+    resolution: {integrity: sha512-dLUIkoYrIJhGXfF2wGLTfb46vUokEsO/OoE21TSfmahYrx7ysTmnwbePsznFaHlwgZhQEh6AlLvthLCeY21b1A==}
+
+  '@dnd-kit/svelte@0.3.2':
+    resolution: {integrity: sha512-HkTnx/3GnxfVNqHSojxhxp5r+KymL9Q7UI2gonXN2+bmdObw03FSQOjicOoRzlV2u9o5DtK1sU4YUQAfkLCGGQ==}
+    peerDependencies:
+      svelte: ^5.29.0
+
   '@eslint-community/eslint-utils@4.10.1':
     resolution: {integrity: sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==}
     engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
@@ -313,6 +339,9 @@ packages:
   '@polka/url@1.0.0-next.29':
     resolution: {integrity: sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww==}
 
+  '@preact/signals-core@1.14.4':
+    resolution: {integrity: sha512-HNB6HYeYKhQbJ1aKl+YRjrS4+QWHLKX6qKoUsfS/m0vqzsVaEBiZiaKbG/e+NKk2ch5ALQr/ihWaMHxiCuuWHA==}
+
   '@rolldown/binding-android-arm64@1.2.4':
     resolution: {integrity: sha512-jHC2cnyKz5xU2fhECtFl8OZ83cYNt13GZQD+0uMJ/X3o+ijmd56okHhTUwxVSHPx1IRVIJEZ1/1pPzeLCU6XKA==}
     engines: {node: ^20.19.0 || >=22.12.0}
@@ -1518,6 +1547,9 @@ packages:
     peerDependencies:
       typescript: '>=4.8.4'
 
+  tslib@2.8.1:
+    resolution: {integrity: sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==}
+
   type-check@0.4.0:
     resolution: {integrity: sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==}
     engines: {node: '>= 0.8.0'}
@@ -1744,6 +1776,44 @@ snapshots:
     dependencies:
       postcss-selector-parser: 7.1.5
 
+  '@dnd-kit/abstract@0.3.2':
+    dependencies:
+      '@dnd-kit/geometry': 0.3.2
+      '@dnd-kit/state': 0.3.2
+      tslib: 2.8.1
+
+  '@dnd-kit/collision@0.3.2':
+    dependencies:
+      '@dnd-kit/abstract': 0.3.2
+      '@dnd-kit/geometry': 0.3.2
+      tslib: 2.8.1
+
+  '@dnd-kit/dom@0.3.2':
+    dependencies:
+      '@dnd-kit/abstract': 0.3.2
+      '@dnd-kit/collision': 0.3.2
+      '@dnd-kit/geometry': 0.3.2
+      '@dnd-kit/state': 0.3.2
+      tslib: 2.8.1
+
+  '@dnd-kit/geometry@0.3.2':
+    dependencies:
+      '@dnd-kit/state': 0.3.2
+      tslib: 2.8.1
+
+  '@dnd-kit/state@0.3.2':
+    dependencies:
+      '@preact/signals-core': 1.14.4
+      tslib: 2.8.1
+
+  '@dnd-kit/svelte@0.3.2(svelte@5.56.9(@typescript-eslint/types@8.67.0))':
+    dependencies:
+      '@dnd-kit/abstract': 0.3.2
+      '@dnd-kit/dom': 0.3.2
+      '@dnd-kit/state': 0.3.2
+      svelte: 5.56.9(@typescript-eslint/types@8.67.0)
+      tslib: 2.8.1
+
   '@eslint-community/eslint-utils@4.10.1(eslint@10.9.0(supports-color@10.2.2))':
     dependencies:
       eslint: 10.9.0(supports-color@10.2.2)
@@ -1847,6 +1917,8 @@ snapshots:
 
   '@polka/url@1.0.0-next.29': {}
 
+  '@preact/signals-core@1.14.4': {}
+
   '@rolldown/binding-android-arm64@1.2.4':
     optional: true
 
@@ -2991,6 +3063,8 @@ snapshots:
     dependencies:
       typescript: 6.0.3
 
+  tslib@2.8.1: {}
+
   type-check@0.4.0:
     dependencies:
       prelude-ls: 1.2.1

web/src/app.css

@@ -177,6 +177,7 @@
 		--duration-l: 0.8s;
 
 		--z-dropdown: 10;
+		--z-drag: 20;
 	}
 
 	[data-theme="dark"] {

web/src/lib/components/display/StepCard.svelte

@@ -3,55 +3,44 @@
 	import IconButton from "$lib/components/ui/IconButton.svelte";
 	import { t } from "$lib/i18n/t";
 	import type { Snippet } from "svelte";
+	import type { Attachment } from "svelte/attachments";
 
 	interface Props {
 		index: number;
 		title?: string;
 		type?: string;
-		draggable?: boolean;
 		collapsed?: boolean;
 		tools?: Snippet;
 		children?: Snippet;
 		onremove?: () => void;
 		ontoggle?: () => void;
-		ondragstart?: (e: DragEvent) => void;
-		ondragover?: (e: DragEvent) => void;
-		ondrop?: (e: DragEvent) => void;
-		ondragend?: () => void;
+		// dnd-kit attachments wired by SortableStepCard; noop on static usage.
+		elementAttachment?: Attachment<HTMLElement>;
+		handleAttachment?: Attachment<HTMLElement>;
 	}
 
+	const noopAttach: Attachment<HTMLElement> = () => {};
+
 	let {
 		index,
 		title,
 		type,
-		draggable = false,
 		collapsed = false,
 		tools,
 		children,
 		onremove,
 		ontoggle,
-		ondragstart,
-		ondragover,
-		ondrop,
-		ondragend,
+		elementAttachment = noopAttach,
+		handleAttachment = noopAttach,
 	}: Props = $props();
 </script>
 
-<article
-	class="step-card"
-	ondragover={(e) => ondragover?.(e)}
-	ondrop={(e) => ondrop?.(e)}
->
-	<header
-		class="step-head"
-		role="button"
-		tabindex="0"
-		{draggable}
-		ondragstart={(e) => ondragstart?.(e)}
-		ondragend={() => ondragend?.()}
-	>
+<article class="step-card" {@attach elementAttachment}>
+	<header class="step-head" role="button" tabindex="0">
 		<span class="step-index">{index.toString().padStart(2, "0")}</span>
+		<span class="drag-handle" {@attach handleAttachment}>
 			<GripVertical size={16} class="drag" aria-hidden="true" />
+		</span>
 		<div class="step-heading-text">
 			{#if type}<span class="step-type">{type}</span>{/if}
 			{#if title}<h2 class="step-title">{title}</h2>{/if}
@@ -101,6 +90,12 @@
 		font: var(--font-size-s) var(--font-mono);
 		color: var(--color-main);
 	}
+	.drag-handle {
+		display: flex;
+		align-items: center;
+		cursor: grab;
+		touch-action: none;
+	}
 	.step-heading-text {
 		flex: 1;
 		display: flex;
@@ -127,6 +122,5 @@
 	}
 	.step-card :global(.drag) {
 		color: var(--color-border);
-		cursor: grab;
 	}
 </style>

web/src/lib/components/schema/PartsGrid.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { toDataUrl } from "$lib/core/io";
+	import { cachedDataUrl } from "$lib/core/io";
 	import type { ToolImageFile } from "$lib/registry";
 
 	interface Props {
@@ -8,7 +8,7 @@
 	let { files }: Props = $props();
 
 	const parts = $derived(
-		files.map((file) => ({ name: file.name, url: toDataUrl(file.image) })),
+		files.map((file) => ({ name: file.name, url: cachedDataUrl(file.image) })),
 	);
 </script>
 

web/src/lib/components/schema/SchemaAlignedLayout.svelte

@@ -1,355 +0,0 @@
-<script lang="ts">
-	import ChipButton from "$lib/components/ui/ChipButton.svelte";
-	import Toggle from "$lib/components/ui/Toggle.svelte";
-	import { toDataUrl, type OutputMime } from "$lib/core/io";
-	import type { PixelImage } from "$lib/core/types";
-	import { t } from "$lib/i18n/t";
-	import type { ChainStep } from "$lib/pipeline.svelte";
-	import type {
-		FileResult,
-		InputMode,
-		ResultKind,
-		ResultNote,
-		ToolImageFile,
-	} from "$lib/registry";
-	import type { Snippet } from "svelte";
-	import AddStepButton from "./AddStepButton.svelte";
-	import PartsGrid from "./PartsGrid.svelte";
-	import PreviewTile from "./PreviewTile.svelte";
-	import SchemaActions from "./SchemaActions.svelte";
-	import SchemaResultTile from "./SchemaResultTile.svelte";
-	import SchemaSourceTile from "./SchemaSourceTile.svelte";
-
-	interface Props {
-		steps: ChainStep[];
-		stepCard: Snippet<[ChainStep, number]>;
-		canExtend: boolean;
-		aligned: boolean;
-		inputMode: InputMode;
-		source: PixelImage | null;
-		sourceFiles: ToolImageFile[];
-		textSource: string;
-		running: boolean;
-		resultKind: ResultKind;
-		result: PixelImage | null;
-		resultNote: ResultNote | null;
-		fileResult: FileResult | null;
-		textResult: string | null;
-		textVars: Record<string, string | number> | undefined;
-		toolId: string;
-		format: OutputMime;
-		quality: number | undefined;
-		limitKb: number | undefined;
-		alphaLoss: boolean;
-		errorText: string;
-		warnings: string[];
-		stepResults: (PixelImage | null)[];
-		stepFileSets: ToolImageFile[][];
-		stepMasks: (PixelImage | null)[];
-		stepMaskOn: boolean[];
-		stepMaskable: boolean[];
-		onaddstep: (index: number, toolId: string) => void;
-		ontogglestepmask: (index: number) => void;
-		ontextinput: (text: string) => void;
-		onrendertext: () => void;
-		onupload: (file: File) => void;
-		onuploadmany: (files: File[]) => void;
-		ondownload: () => void;
-		oncopy: () => void;
-		ondownloadtxt: () => void;
-		onformat: (mime: OutputMime) => void;
-		onquality: (value: number) => void;
-		onlimit: (kb: number | undefined) => void;
-	}
-	let {
-		steps,
-		stepCard,
-		canExtend,
-		aligned = $bindable(false),
-		inputMode,
-		source,
-		sourceFiles,
-		textSource,
-		running,
-		resultKind,
-		result,
-		resultNote,
-		fileResult,
-		textResult,
-		textVars,
-		toolId,
-		format,
-		quality,
-		limitKb,
-		alphaLoss,
-		errorText,
-		warnings,
-		stepResults,
-		stepFileSets,
-		stepMasks,
-		stepMaskOn,
-		stepMaskable,
-		onaddstep,
-		ontogglestepmask,
-		ontextinput,
-		onrendertext,
-		onupload,
-		onuploadmany,
-		ondownload,
-		oncopy,
-		ondownloadtxt,
-		onformat,
-		onquality,
-		onlimit,
-	}: Props = $props();
-</script>
-
-{#snippet maskChip(i: number)}
-	{#if stepMaskable[i]}
-		<ChipButton
-			label={t("resultCard.maskToggle")}
-			active={stepMaskOn[i]}
-			onclick={() => ontogglestepmask(i)}
-		/>
-	{/if}
-{/snippet}
-
-<div class="aligned">
-	<div class="aligned-row">
-		<div></div>
-		<div class="panel-segment head-segment">
-			<span class="label">{t("resultCard.previewPanel")}</span>
-			<label class="align-toggle">
-				<Toggle bind:checked={aligned} label={t("chain.alignToggle")} />
-				<span>{t("chain.alignToggle")}</span>
-			</label>
-			<SchemaActions
-				{inputMode}
-				{resultKind}
-				canDownload={result !== null}
-				{running}
-				{format}
-				{quality}
-				{limitKb}
-				{alphaLoss}
-				{onupload}
-				{ondownload}
-				{onformat}
-				{onquality}
-				{onlimit}
-			/>
-		</div>
-	</div>
-	{#if errorText}
-		<p class="error" role="alert">{errorText}</p>
-	{/if}
-	{#each warnings as w (w)}
-		<p class="warn" role="status">{w}</p>
-	{/each}
-	{#if canExtend}
-		<div class="aligned-row">
-			<AddStepButton onadd={(id) => onaddstep(0, id)} />
-			<div class="panel-segment connect-segment"></div>
-		</div>
-	{/if}
-	{#each steps as step, i (step.key)}
-		{@const input = i === 0 ? null : stepResults[i - 1]}
-		{@const out = stepResults[i]}
-		{#if i > 0}
-			<div class="group-divider">
-				<div class="gd-cell"></div>
-			</div>
-		{/if}
-		<div class="aligned-row">
-			{@render stepCard(step, i)}
-			<div
-				class="panel-segment pair-segment"
-				class:last-segment={i === steps.length - 1 && !canExtend}
-			>
-				{#if i === 0}
-					<SchemaSourceTile
-						mode={inputMode}
-						{source}
-						sources={sourceFiles}
-						{textSource}
-						{running}
-						fileCount={sourceFiles.length}
-						{ontextinput}
-						{onrendertext}
-						{onupload}
-						{onuploadmany}
-					/>
-				{:else}
-					{@const inSet = stepFileSets[i - 1] ?? []}
-					<PreviewTile
-						label={t("chain.inputLegend")}
-						viewMode="image"
-						dims={input ? `${input.width} × ${input.height}` : undefined}
-						parts={inSet.length > 1 ? inSet.length : undefined}
-					>
-						{#if inSet.length > 1}
-							<PartsGrid files={inSet} />
-						{:else if input}
-							<img src={toDataUrl(input)} alt="" />
-						{:else}
-							<span class="empty">{t("resultCard.noResult")}</span>
-						{/if}
-					</PreviewTile>
-				{/if}
-				{#if i === steps.length - 1}
-					<SchemaResultTile
-						{resultKind}
-						result={out}
-						{resultNote}
-						{fileResult}
-						{textResult}
-						{textVars}
-						{toolId}
-						{running}
-						mask={stepMasks[i] ?? null}
-						maskOn={stepMaskOn[i] ?? false}
-						ontogglemask={stepMaskable[i]
-							? () => ontogglestepmask(i)
-							: undefined}
-						{oncopy}
-						{ondownloadtxt}
-					/>
-				{:else}
-					{@const outSet = stepFileSets[i] ?? []}
-					<PreviewTile
-						label={t("chain.stepResult", { n: i + 1 })}
-						viewMode="image"
-						dims={out ? `${out.width} × ${out.height}` : undefined}
-						parts={outSet.length > 1 ? outSet.length : undefined}
-					>
-						{#snippet actions()}
-							{@render maskChip(i)}
-						{/snippet}
-						{#if outSet.length > 1 && !stepMaskOn[i]}
-							<PartsGrid files={outSet} />
-						{:else if out}
-							<img
-								src={toDataUrl(
-									stepMaskOn[i] && stepMasks[i] ? stepMasks[i]! : out,
-								)}
-								alt=""
-							/>
-						{:else}
-							<span class="empty">{t("resultCard.noResult")}</span>
-						{/if}
-					</PreviewTile>
-				{/if}
-			</div>
-		</div>
-		{#if canExtend}
-			<div class="aligned-row">
-				<AddStepButton onadd={(id) => onaddstep(i + 1, id)} />
-				<div
-					class="panel-segment connect-segment"
-					class:add-last={i === steps.length - 1}
-				></div>
-			</div>
-		{/if}
-	{/each}
-</div>
-
-<style>
-	.aligned {
-		display: grid;
-	}
-	.aligned-row {
-		display: grid;
-		grid-template-columns: minmax(var(--size-workspace-min), 1fr) 2fr;
-		gap: var(--space-xxl);
-		align-items: start;
-	}
-	/* Сегменты справа образуют «одну панель»: общий фон, боковые границы,
-	   верх у шапки и низ у последней строки. */
-	.panel-segment {
-		background: var(--color-panel);
-		border-left: var(--size-border) solid var(--color-border);
-		border-right: var(--size-border) solid var(--color-border);
-		padding: var(--space-xl);
-	}
-	.head-segment {
-		display: flex;
-		align-items: center;
-		gap: var(--space-xl);
-		flex-wrap: wrap;
-		border-top: var(--size-border) solid var(--color-border);
-		border-bottom: var(--size-border) solid var(--color-border);
-		border-radius: var(--radius-m) var(--radius-m) 0 0;
-	}
-	.head-segment .label {
-		font: var(--font-size-s) var(--font-mono);
-		letter-spacing: var(--space-text-l);
-		text-transform: uppercase;
-		color: var(--color-main);
-	}
-	.pair-segment {
-		display: grid;
-		grid-template-columns: 1fr 1fr;
-		gap: var(--space-l);
-	}
-	/* Коннектор в строках «Add step»: продолжает боковые границы панели. */
-	.connect-segment {
-		align-self: stretch;
-		padding: 0;
-	}
-	.connect-segment.add-last {
-		border-bottom: var(--size-border) solid var(--color-border);
-		border-radius: 0 0 var(--radius-m) var(--radius-m);
-	}
-	/* Полоса-разделитель между группами: ячейки с фоном и боковыми границами
-	   (как у карточки слева и панели справа), сверху — линия через всю ширину. */
-	.group-divider {
-		position: relative;
-		display: grid;
-		grid-template-columns: minmax(var(--size-workspace-min), 1fr) 2fr;
-		gap: var(--space-xxl);
-	}
-	.gd-cell {
-		grid-column: 2;
-		background: var(--color-panel);
-		border-left: var(--size-border) solid var(--color-border);
-		border-right: var(--size-border) solid var(--color-border);
-		padding: var(--space-s) 0;
-	}
-	.group-divider::after {
-		content: "";
-		position: absolute;
-		inset: 0 0 auto;
-		border-top: var(--size-border) solid var(--color-border);
-	}
-	.last-segment {
-		border-bottom: var(--size-border) solid var(--color-border);
-		border-radius: 0 0 var(--radius-m) var(--radius-m);
-	}
-	.align-toggle {
-		display: inline-flex;
-		align-items: center;
-		gap: var(--space-m);
-		margin-right: auto;
-		color: var(--color-text-muted);
-		font: var(--font-size-s) var(--font-mono);
-		cursor: pointer;
-	}
-	.error {
-		margin: 0;
-		color: var(--color-danger);
-		font: var(--font-size-s) var(--font-mono);
-	}
-	.warn {
-		margin: 0;
-		color: var(--color-warning);
-		font: var(--font-size-s) var(--font-mono);
-	}
-	.empty {
-		font: var(--font-size-s) var(--font-mono);
-	}
-	@media (--bp-tablet) {
-		.aligned-row {
-			grid-template-columns: 1fr;
-		}
-	}
-</style>

web/src/lib/components/schema/SchemaPreview.svelte

@@ -1,178 +0,0 @@
-<script lang="ts">
-	import {
-		hasPreviewResult,
-		type PreviewHeadModel,
-		type PreviewResultModel,
-		type PreviewSourceModel,
-		type PreviewStepsModel,
-	} from "./schema-preview-model";
-	import SchemaActions from "./SchemaActions.svelte";
-	import PartsGrid from "./PartsGrid.svelte";
-	import SchemaResultTile from "./SchemaResultTile.svelte";
-	import SchemaSourceTile from "./SchemaSourceTile.svelte";
-	import PreviewTile from "./PreviewTile.svelte";
-	import Toggle from "$lib/components/ui/Toggle.svelte";
-	import ChipButton from "$lib/components/ui/ChipButton.svelte";
-	import { toDataUrl } from "$lib/core/io";
-	import type { PixelImage } from "$lib/core/types";
-	import { t } from "$lib/i18n/t";
-	import type { InputMode, ResultKind } from "$lib/registry";
-
-	interface Props {
-		inputMode: InputMode;
-		resultKind?: ResultKind;
-		toolId: string;
-		running?: boolean;
-		error?: string;
-		aligned?: boolean;
-		head: PreviewHeadModel;
-		source: PreviewSourceModel;
-		steps?: PreviewStepsModel;
-		result: PreviewResultModel;
-	}
-	let {
-		inputMode,
-		resultKind = "image",
-		toolId,
-		running = false,
-		error = "",
-		aligned = $bindable(false),
-		head,
-		source,
-		steps = {},
-		result,
-	}: Props = $props();
-
-	const stepResults = $derived(steps.results ?? []);
-	const stepFileSets = $derived(steps.fileSets ?? []);
-	const stepMaskable = $derived(steps.maskable ?? []);
-	const stepMaskOn = $derived(steps.maskOn ?? []);
-	const stepMasks = $derived(steps.masks ?? []);
-
-	const hasResult = $derived(
-		hasPreviewResult({
-			inputMode,
-			resultKind,
-			result: result.result,
-			fileResult: result.fileResult ?? null,
-			textResult: result.textResult ?? null,
-		}),
-	);
-</script>
-
-<div class="panel-head">
-	<span class="label">{t("resultCard.previewPanel")}</span>
-	{#if stepResults.length > 1}
-		<label class="align-toggle">
-			<Toggle bind:checked={aligned} label={t("chain.alignToggle")} />
-			<span>{t("chain.alignToggle")}</span>
-		</label>
-	{/if}
-	<SchemaActions
-		{inputMode}
-		{resultKind}
-		canDownload={hasResult}
-		{running}
-		{...head}
-	/>
-</div>
-
-{#if error}
-	<p class="error" role="alert">{error}</p>
-{/if}
-
-<div class="pair">
-	<SchemaSourceTile
-		mode={inputMode}
-		{running}
-		onupload={head.onupload}
-		{...source}
-	/>
-	{#each stepResults.slice(0, -1) as img, i (i)}
-		{@const set = stepFileSets[i] ?? []}
-		{#if set.length > 1 && !stepMaskOn[i]}
-			<PreviewTile
-				label={t("chain.stepResult", { n: i + 1 })}
-				viewMode="image"
-				parts={set.length}
-				partsDims={`${set[0].image.width} × ${set[0].image.height}`}
-			>
-				{#snippet actions()}
-					{#if stepMaskable[i]}
-						<ChipButton
-							label={t("resultCard.maskToggle")}
-							active={stepMaskOn[i] ?? false}
-							onclick={() => steps.ontogglestepmask?.(i)}
-						/>
-					{/if}
-				{/snippet}
-				<PartsGrid files={set} />
-			</PreviewTile>
-		{:else if img}
-			<PreviewTile
-				label={t("chain.stepResult", { n: i + 1 })}
-				viewMode="image"
-				dims={`${img.width} × ${img.height}`}
-			>
-				{#snippet actions()}
-					{#if stepMaskable[i]}
-						<ChipButton
-							label={t("resultCard.maskToggle")}
-							active={stepMaskOn[i] ?? false}
-							onclick={() => steps.ontogglestepmask?.(i)}
-						/>
-					{/if}
-				{/snippet}
-				<img
-					src={toDataUrl(
-						stepMaskOn[i] && stepMasks[i] ? (stepMasks[i] as PixelImage) : img,
-					)}
-					alt=""
-				/>
-			</PreviewTile>
-		{/if}
-	{/each}
-	<SchemaResultTile {resultKind} {toolId} {running} {...result} />
-</div>
-
-<style>
-	.panel-head {
-		display: flex;
-		justify-content: space-between;
-		align-items: center;
-		gap: var(--space-m);
-		padding-bottom: var(--space-l);
-		border-bottom: var(--size-border) solid var(--color-border);
-		margin-bottom: var(--space-xl);
-	}
-	.label {
-		font: var(--font-size-s) var(--font-mono);
-		letter-spacing: var(--space-text-l);
-		text-transform: uppercase;
-		color: var(--color-main);
-	}
-	.align-toggle {
-		display: inline-flex;
-		align-items: center;
-		gap: var(--space-m);
-		margin-right: auto;
-		color: var(--color-text-muted);
-		font: var(--font-size-s) var(--font-mono);
-		cursor: pointer;
-	}
-	.error {
-		margin: 0 0 var(--space-l);
-		color: var(--color-danger);
-		font: var(--font-size-s) var(--font-mono);
-	}
-	.pair {
-		display: grid;
-		grid-template-columns: 1fr 1fr;
-		gap: var(--space-l);
-	}
-	@media (--bp-tablet) {
-		.pair {
-			grid-template-columns: 1fr;
-		}
-	}
-</style>

web/src/lib/components/schema/SchemaResultTile.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { toDataUrl } from "$lib/core/io";
+	import { cachedDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
 	import { t } from "$lib/i18n/t";
 	import type { FileResult, ResultKind, ResultNote } from "$lib/registry";
@@ -41,7 +41,7 @@
 	}: Props = $props();
 
 	const shown = $derived(maskOn && mask ? mask : result);
-	const resultUrl = $derived(shown ? toDataUrl(shown) : null);
+	const resultUrl = $derived(shown ? cachedDataUrl(shown) : null);
 	const resultDims = $derived(
 		resultKind === "image" && result
 			? `${result.width} × ${result.height}`

web/src/lib/components/schema/SchemaSourceTile.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { toDataUrl } from "$lib/core/io";
+	import { cachedDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
 	import { t } from "$lib/i18n/t";
 	import type { InputMode, ToolImageFile } from "$lib/registry";
@@ -33,7 +33,7 @@
 		onuploadmany,
 	}: Props = $props();
 
-	const sourceUrl = $derived(source ? toDataUrl(source) : null);
+	const sourceUrl = $derived(source ? cachedDataUrl(source) : null);
 	const sourceDims = $derived(
 		source
 			? `${source.width} × ${source.height}` +

web/src/lib/components/schema/SchemaToolView.svelte

@@ -1,60 +1,44 @@
 <script lang="ts">
-	import { goto } from "$app/navigation";
-	import { resolve } from "$app/paths";
-	import StepCard from "$lib/components/display/StepCard.svelte";
 	import Button from "$lib/components/ui/Button.svelte";
 	import { ButtonVariantDefine } from "$lib/components/ui/define";
 	import { isFav, toggleFav } from "$lib/favorites.svelte";
 	import { Star } from "@lucide/svelte";
-	import { hasTransparency } from "$lib/core/analyze";
+	import { DragDropProvider } from "@dnd-kit/svelte";
 	import { debounce } from "$lib/core/debounce";
-	import { ToolError } from "$lib/core/errors";
-	import { decodeFile, type OutputMime } from "$lib/core/io";
-	import { outputFormatByMime } from "$lib/output-formats";
+	import { cachedDataUrl } from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
-	import { baseName, uniqueName, type ChainWarning } from "$lib/run-chain";
 	import {
+		chainStepTitle,
+		chainWarningText,
 		pageDescription,
 		pageTitle,
-		chainStepTitle,
 	} from "$lib/i18n/schema-tool-strings";
 	import { t } from "$lib/i18n/t";
-	import {
-		autoChainName,
-		createNamedChain,
-		getChain,
-		stashHandoff,
-		takeHandoff,
-		updateChainSteps,
-	} from "$lib/chains.svelte";
-	import {
-		createChain,
-		isStructuralDefault,
-		type ChainStep,
-	} from "$lib/pipeline.svelte";
-	import {
-		getTool,
-		type Page,
-		type Tool,
-		type ToolImageFile,
-	} from "$lib/registry";
-	import {
-		applySourceDefaults,
-		clampSourceAwareMaxes,
-		sanitizeSchemaParams,
-	} from "$lib/registry-schema";
-	import { onMount } from "svelte";
-	import { SvelteSet } from "svelte/reactivity";
+	import { moveStep, type ChainStep } from "$lib/pipeline.svelte";
+	import { getTool, type Page, type Tool } from "$lib/registry";
+	import ChipButton from "$lib/components/ui/ChipButton.svelte";
+	import Toggle from "$lib/components/ui/Toggle.svelte";
 	import AddStepButton from "./AddStepButton.svelte";
-	import SchemaAlignedLayout from "./SchemaAlignedLayout.svelte";
+	import PartsGrid from "./PartsGrid.svelte";
+	import PreviewTile from "./PreviewTile.svelte";
+	import SchemaActions from "./SchemaActions.svelte";
 	import SchemaFields from "./SchemaFields.svelte";
-	import SchemaPreview from "./SchemaPreview.svelte";
+	import SchemaResultTile from "./SchemaResultTile.svelte";
+	import SchemaSourceTile from "./SchemaSourceTile.svelte";
+	import SortableStepCard from "./SortableStepCard.svelte";
+	import StepReorderOverlay from "./StepReorderOverlay.svelte";
 	import ToolPickerButton from "./ToolPickerButton.svelte";
+	import { createChainHost } from "./chain-host.svelte";
+	import { createOutputControls } from "./output-controls.svelte";
+	import { hasPreviewResult } from "./schema-preview-model";
 	import { createSchemaToolRunner } from "./schema-tool-runner.svelte";
 	import {
 		createSchemaToolState,
 		toolSchemaOf,
 	} from "./schema-tool-state.svelte";
+	import { createSourceUpload } from "./source-upload.svelte";
+	import { createStepDnd } from "./step-dnd.svelte";
+	import { createStepMasks } from "./step-mask.svelte";
 
 	interface Props {
 		page: Page;
@@ -69,48 +53,21 @@
 	const inputMode = $derived(tool.input);
 
 	let aligned = $state(false);
-	let source = $state<PixelImage | null>(null);
-	// The full named input set (multi-upload); `source` above is the first
-	// image for preview/defaults. Single upload = one element.
-	let sourceFiles = $state<ToolImageFile[]>([]);
-	let textSource = $state("");
-	let sourceWarnings = $state<ChainWarning[]>([]);
-	let initedFor = $state("");
-	let format = $state<OutputMime>("image/png");
-	// Lossy-format quality for tools without a quality param in the schema.
-	let formatQuality = $state<Record<string, number>>({});
-	// Optional download size limit (KB); undefined = no limit.
-	let limitKb = $state<number | undefined>(undefined);
-	// Mask preview per step (keyed by step.key): the toggle lives on every
-	// step result tile, not just the final one.
-	const maskOnKeys = new SvelteSet<string>();
-	// Mask preview: recomputed on the main thread per toggled step from that
-	// step's input; a mask never enters the chain itself.
-	const maskResults = $derived.by(() => {
-		const next: Record<string, PixelImage | null> = {};
-		steps.forEach((step, i) => {
-			if (!maskOnKeys.has(step.key)) return;
-			const stepTool = getTool(step.id);
-			if (!stepTool?.runMask) return;
-			const input = i === 0 ? source : stepResults[i - 1];
-			if (!input) return;
-			// Same contract as executor.ts: params are sanitized against the
-			// schema with the step input as the source context.
-			const stepSchema = toolSchemaOf(step);
-			const params = stepSchema
-				? sanitizeSchemaParams(stepSchema, step.params, { source: input })
-				: step.params;
-			try {
-				next[step.key] = stepTool.runMask({ params, source: input });
-			} catch {
-				next[step.key] = null;
-			}
-		});
-		return next;
+
+	// Composition root: feature state lives in sibling composables
+	// (source-upload, output-controls, step-mask, chain-host); execution in
+	// schema-tool-runner, step state in schema-tool-state.
+	const upload = createSourceUpload({
+		inputMode: () => inputMode,
+		steps: () => stepState.steps,
+		setSteps: (v) => (stepState.steps = v),
+		touchedFor: (key) => stepState.touchedFor(key),
+		reportError: (e) => runner.reportError(e),
+		clearError: () => (runner.displayError = null),
 	});
 
 	const stepState = createSchemaToolState({
-		source: () => source,
+		source: () => upload.source,
 		stepDims: () => runner.stepDims,
 		clearResults: () => runner.clearResults(),
 	});
@@ -121,20 +78,36 @@
 		removeStepAt,
 		toggleStep,
 		replaceStepTool,
-		onStepDrop,
 	} = stepState;
 	const steps = $derived(stepState.steps);
+	const stepDnd = createStepDnd({
+		onMove: (from, to) => {
+			stepState.steps = moveStep(stepState.steps, from, to);
+		},
+	});
+
+	const lastTool = $derived(
+		(steps.length > 0 ? getTool(steps[steps.length - 1].id) : undefined) ??
+			tool,
+	);
+
+	const output = createOutputControls({
+		lastTool: () => lastTool,
+		steps: () => steps,
+		result: () => runner.result,
+		setStepValue,
+	});
 
 	const runner = createSchemaToolRunner({
 		pageSlug: () => page.slug,
 		schema: () => schema,
 		steps: () => steps,
-		source: () => source,
-		sourceFiles: () => sourceFiles,
-		textSource: () => textSource,
-		format: () => format,
-		quality: () => currentQuality,
-		limitKb: () => limitKb,
+		source: () => upload.source,
+		sourceFiles: () => upload.sourceFiles,
+		textSource: () => upload.textSource,
+		format: () => output.format,
+		quality: () => output.quality,
+		limitKb: () => output.limitKb,
 		lastTool: () => lastTool,
 	});
 	const { run, download, copyText, downloadText } = runner;
@@ -150,12 +123,27 @@
 	const stepFileSets = $derived(runner.stepFileSets);
 	const runWarnings = $derived(runner.runWarnings);
 	const displayError = $derived(runner.displayError);
-	const allWarnings = $derived([...sourceWarnings, ...runWarnings]);
+	const allWarnings = $derived([...upload.sourceWarnings, ...runWarnings]);
+
+	const masks = createStepMasks({
+		steps: () => steps,
+		source: () => upload.source,
+		stepResults: () => runner.stepResults,
+	});
+
+	const host = createChainHost({
+		page: () => page,
+		chainId: () => chainId,
+		schema: () => schema,
+		lastTool: () => lastTool,
+		steps: () => steps,
+		stepState,
+		source: upload,
+		output,
+		resetRun: () => runner.resetForHost(),
+		clearMasks: () => masks.clear(),
+	});
 
-	const lastTool = $derived(
-		(steps.length > 0 ? getTool(steps[steps.length - 1].id) : undefined) ??
-			tool,
-	);
 	const resultKind = $derived(lastTool.result ?? "image");
 	// Display kind follows the actual output: a batch run of an image tool
 	// produces a file set, not a single image.
@@ -167,36 +155,22 @@
 	const alignedMode = $derived(
 		aligned && resultKind === "image" && steps.length > 1,
 	);
-
-	const alphaLoss = $derived(
-		resultKind === "image" &&
-			result !== null &&
-			!outputFormatByMime(format).supportsAlpha &&
-			hasTransparency(result),
+	const hasResult = $derived(
+		hasPreviewResult({
+			inputMode,
+			resultKind: displayResultKind,
+			result,
+			fileResult,
+			textResult,
+		}),
 	);
-	// If the last step's schema has a quality param (convert tools), it is the
-	// single source of quality; the dropdown edits the same value.
-	const qualityParamId = $derived(lastTool.output?.qualityParamId);
+
 	const lastParams = $derived(steps.at(-1)?.params);
 	const resultNote = $derived(
 		result && lastTool.resultNote
 			? lastTool.resultNote(lastParams ?? {}, result)
 			: null,
 	);
-	const currentQuality = $derived.by(() => {
-		const setting = outputFormatByMime(format).settings?.quality;
-		if (!setting) return undefined;
-		if (qualityParamId && lastParams) return Number(lastParams[qualityParamId]);
-		return formatQuality[format] ?? setting.default;
-	});
-
-	function setFormatQuality(q: number) {
-		if (qualityParamId) {
-			setStepValue(steps.length - 1, qualityParamId, q);
-		} else {
-			formatQuality = { ...formatQuality, [format]: q };
-		}
-	}
 
 	const errorText = $derived.by(() => {
 		const current = displayError;
@@ -206,200 +180,20 @@
 			: current.text;
 	});
 
-	const stepMaskable = $derived(steps.map((s) => !!getTool(s.id)?.runMask));
-	const stepMaskOn = $derived(steps.map((s) => maskOnKeys.has(s.key)));
-	const stepMasks = $derived(steps.map((s) => maskResults[s.key] ?? null));
-
 	const debouncedRun = debounce(() => run(), 200);
 
-	function stepTitle(toolId: string): string {
-		return chainStepTitle(toolId);
-	}
-
-	function init() {
-		if (!schema) return;
-		const host = chainId ? `chain:${chainId}` : page.slug;
-		if (host === initedFor) return;
-		initedFor = host;
-		// Invalidate any in-flight run from the previous host.
-		runner.resetForHost();
-		if (chainId) {
-			const handoff = takeHandoff(chainId);
-			stepState.steps = getChain(chainId)?.steps ?? createChain(page);
-			source = handoff?.source ?? null;
-			sourceFiles =
-				handoff?.sourceFiles ??
-				(handoff?.source
-					? [{ name: `${baseName(page.slug)}.png`, image: handoff.source }]
-					: []);
-			textSource = handoff?.textSource ?? "";
-			if (handoff?.format) format = handoff.format;
-			else format = lastTool.output?.mime ?? "image/png";
-			limitKb = handoff?.limitKb;
-		} else {
-			stepState.steps = createChain(page);
-			format = lastTool.output?.mime ?? "image/png";
-			limitKb = undefined;
-			source = null;
-			sourceFiles = [];
-			textSource = "";
-		}
-		sourceWarnings = [];
-		maskOnKeys.clear();
-		stepState.clearMarks();
-	}
-
-	async function handleFiles(files: File[]) {
-		runner.displayError = null;
-		sourceWarnings = [];
-		const decoded: ToolImageFile[] = [];
-		const usedNames = new SvelteSet<string>();
-		let skipped = 0;
-		for (const file of files) {
-			try {
-				const name = uniqueName(`${baseName(file.name)}.png`, usedNames);
-				usedNames.add(name);
-				decoded.push({ name, image: await decodeFile(file) });
-			} catch {
-				skipped++;
-			}
-		}
-		if (decoded.length === 0) {
-			runner.reportError(new ToolError("errors.imageDecode"));
-			return;
-		}
-		if (skipped > 0) {
-			sourceWarnings = [{ kind: "sourceSkip", skipped, total: files.length }];
-		}
-		const firstImage = decoded[0].image;
-		source = firstImage;
-		sourceFiles = decoded;
-		const first = steps[0];
-		const firstSchema = first ? toolSchemaOf(first) : undefined;
-		if (first && firstSchema) {
-			stepState.steps = steps.with(0, {
-				...first,
-				params: clampSourceAwareMaxes(
-					firstSchema,
-					applySourceDefaults(
-						firstSchema,
-						first.params,
-						{ source: firstImage },
-						stepState.touchedFor(first.key),
-					),
-					firstImage,
-				),
-			});
-		}
-	}
-
-	async function handleFile(file: File) {
-		await handleFiles([file]);
-	}
-
 	$effect(() => {
-		init();
-	});
-
-	// Named-chain mode autosaves into the chains store; a plain tool page
-	// persists nothing -- it becomes a named chain on structural change below.
-	$effect(() => {
-		if (!initedFor || !chainId) return;
+		if (!host.inited) return;
+		if (inputMode === "image" && !upload.source) return;
+		if (inputMode === "text" && !upload.textSource.trim()) return;
 		void steps;
-		updateChainSteps(chainId, steps);
-	});
-
-	// A tool page turns into a pipeline on the first structural change (step
-	// added, first tool swapped): create the named chain and swap routes
-	// seamlessly -- steps persist via the store, the source via the handoff.
-	$effect(() => {
-		if (!initedFor || chainId) return;
-		void steps;
-		if (isStructuralDefault(page, steps)) return;
-		const chain = createNamedChain(autoChainName(), steps);
-		stashHandoff(chain.id, {
-			source,
-			sourceFiles,
-			textSource,
-			format,
-			limitKb,
-		});
-		goto(resolve(`/pipeline?id=${chain.id}`), {
-			replaceState: true,
-			keepFocus: true,
-			noScroll: true,
-		});
-	});
-
-	onMount(() => {
-		if (inputMode !== "image") return;
-		function onPaste(e: ClipboardEvent) {
-			const target = e.target as HTMLElement | null;
-			if (target?.closest("input, textarea, [contenteditable]")) return;
-			for (const item of e.clipboardData?.items ?? []) {
-				if (item.kind !== "file" || !item.type.startsWith("image/")) continue;
-				const file = item.getAsFile();
-				if (file) {
-					e.preventDefault();
-					void handleFile(file);
-				}
-				return;
-			}
-		}
-		window.addEventListener("paste", onPaste);
-		return () => window.removeEventListener("paste", onPaste);
-	});
-
-	$effect(() => {
-		if (!initedFor) return;
-		if (inputMode === "image" && !source) return;
-		if (inputMode === "text" && !textSource.trim()) return;
-		void steps;
-		void source;
+		void upload.source;
 		debouncedRun();
 		return () => debouncedRun.cancel();
 	});
 
-	function toggleStepMask(key: string) {
-		if (maskOnKeys.has(key)) maskOnKeys.delete(key);
-		else maskOnKeys.add(key);
-	}
-
-	function toggleStepMaskByIndex(i: number) {
-		const step = steps[i];
-		if (step) toggleStepMask(step.key);
-	}
-
-	function warningText(w: ChainWarning): string {
-		switch (w.kind) {
-			case "partial":
-				return t("chain.warnPartial", { n: w.step, ok: w.ok, total: w.total });
-			case "firstOnly":
-				return t("chain.warnFirstOnly", { n: w.step, total: w.total });
-			case "sourceSkip":
-				return t("chain.warnSourceSkip", {
-					skipped: w.skipped,
-					total: w.total,
-				});
-		}
-	}
-
-	// Explicit save for a structurally default chain (single tuned step): the
-	// auto-create effect only fires on structural change.
-	function saveAsChain() {
-		const chain = createNamedChain(autoChainName(), steps);
-		stashHandoff(chain.id, {
-			source,
-			sourceFiles,
-			textSource,
-			format,
-			limitKb,
-		});
-		goto(resolve(`/pipeline?id=${chain.id}`), {
-			replaceState: true,
-			keepFocus: true,
-			noScroll: true,
-		});
+	function stepTitle(toolId: string): string {
+		return chainStepTitle(toolId);
 	}
 </script>
 
@@ -434,32 +228,19 @@
 					label={t("savedChains.saveAs")}
 					variant={ButtonVariantDefine.OUTLINE}
 					size="s"
-					onclick={saveAsChain}
+					onclick={host.saveAsChain}
 				/>
 			{/if}
 		</header>
 
 		{#snippet stepCard(step: ChainStep, i: number)}
-			<StepCard
-				index={i + 1}
+			<SortableStepCard
+				{step}
+				index={i}
 				title={stepTitle(step.id)}
-				draggable
 				collapsed={step.collapsed ?? false}
 				ontoggle={() => toggleStep(i)}
 				onremove={steps.length > 1 ? () => removeStepAt(step.key) : undefined}
-				ondragstart={(e) => {
-					stepState.dragFrom = i;
-					if (e.dataTransfer) {
-						e.dataTransfer.effectAllowed = "move";
-						e.dataTransfer.setData("text/plain", String(i));
-					}
-				}}
-				ondragover={(e) => {
-					e.preventDefault();
-					if (e.dataTransfer) e.dataTransfer.dropEffect = "move";
-				}}
-				ondrop={(e) => onStepDrop(e, i)}
-				ondragend={() => (stepState.dragFrom = null)}
 			>
 				{#snippet tools()}
 					<ToolPickerButton
@@ -474,127 +255,196 @@
 						schema={stepSchema}
 						values={step.params}
 						toolId={step.id}
-						sourceDims={i === 0 ? (source ?? undefined) : stepDims[i - 1]}
+						sourceDims={i === 0
+							? (upload.source ?? undefined)
+							: stepDims[i - 1]}
 						onchange={(id, v, axis) => setStepValue(i, id, v, axis)}
 						onreset={() => resetStep(i)}
 					/>
 				{/if}
-			</StepCard>
+			</SortableStepCard>
 		{/snippet}
 
-		{#if !alignedMode}
-			<div class="workspace">
-				<section class="settings">
-					{#if canExtend}
-						<AddStepButton onadd={(id) => addStepAt(0, id)} />
-					{/if}
-					{#each steps as step, i (step.key)}
-						{@render stepCard(step, i)}
-						{#if canExtend}
-							<AddStepButton onadd={(id) => addStepAt(i + 1, id)} />
-						{/if}
-					{/each}
-				</section>
-
-				<section class="panel">
-					<SchemaPreview
-						toolId={lastTool.id}
-						{inputMode}
-						resultKind={displayResultKind}
-						running={busy}
-						error={errorText}
-						bind:aligned
-						head={{
-							format,
-							quality: currentQuality,
-							limitKb,
-							alphaLoss,
-							onupload: handleFile,
-							ondownload: download,
-							onformat: (v) => (format = v),
-							onquality: setFormatQuality,
-							onlimit: (v) => (limitKb = v),
-						}}
-						source={{
-							source,
-							sources: sourceFiles,
-							fileCount: sourceFiles.length,
-							textSource,
-							ontextinput: (v) => (textSource = v),
-							onrendertext: run,
-							onuploadmany: handleFiles,
-						}}
-						steps={{
-							results: stepResults,
-							fileSets: stepFileSets,
-							maskable: stepMaskable,
-							maskOn: stepMaskOn,
-							masks: stepMasks,
-							ontogglestepmask: toggleStepMaskByIndex,
-						}}
-						result={{
-							result,
-							resultNote,
-							fileResult,
-							textResult,
-							textVars: verdictVars,
-							mask: stepMasks.at(-1) ?? null,
-							maskOn: stepMaskOn.at(-1) ?? false,
-							ontogglemask: stepMaskable.at(-1)
-								? () => toggleStepMask(steps[steps.length - 1].key)
-								: undefined,
-							oncopy: copyText,
-							ondownloadtxt: downloadText,
-						}}
+		{#snippet maskChip(i: number)}
+			{#if masks.maskable[i]}
+				<ChipButton
+					label={t("resultCard.maskToggle")}
+					active={masks.maskOn[i] ?? false}
+					onclick={() => masks.toggleByIndex(i)}
 				/>
-				</section>
-			</div>
-			{#each allWarnings as w (warningText(w))}
-				<p class="warn" role="status">{warningText(w)}</p>
-			{/each}
-		{:else}
-			<SchemaAlignedLayout
-				{steps}
-				{stepCard}
-				{canExtend}
-				bind:aligned
-				{inputMode}
-				{source}
-				{sourceFiles}
-				{textSource}
+			{/if}
+		{/snippet}
+
+		{#snippet inputTile(i: number)}
+			{#if i === 0}
+				<SchemaSourceTile
+					mode={inputMode}
+					source={upload.source}
+					sources={upload.sourceFiles}
+					textSource={upload.textSource}
 					running={busy}
+					fileCount={upload.sourceFiles.length}
+					ontextinput={(v) => (upload.textSource = v)}
+					onrendertext={run}
+					onupload={upload.handleFile}
+					onuploadmany={upload.handleFiles}
+				/>
+			{:else}
+				{@const input = stepResults[i - 1]}
+				{@const inSet = stepFileSets[i - 1] ?? []}
+				<PreviewTile
+					label={t("chain.inputLegend")}
+					viewMode="image"
+					dims={input ? `${input.width} × ${input.height}` : undefined}
+					parts={inSet.length > 1 ? inSet.length : undefined}
+				>
+					{#if inSet.length > 1}
+						<PartsGrid files={inSet} />
+					{:else if input}
+						<img src={cachedDataUrl(input)} alt="" />
+					{:else}
+						<span class="empty">{t("resultCard.noResult")}</span>
+					{/if}
+				</PreviewTile>
+			{/if}
+		{/snippet}
+
+		{#snippet outputTile(i: number)}
+			{@const out = stepResults[i]}
+			{#if i === steps.length - 1}
+				<SchemaResultTile
 					resultKind={displayResultKind}
-				{result}
+					result={out}
 					{resultNote}
 					{fileResult}
 					{textResult}
 					textVars={verdictVars}
 					toolId={lastTool.id}
-				{format}
-				quality={currentQuality}
-				{limitKb}
-				{alphaLoss}
-				{errorText}
-				warnings={allWarnings.map(warningText)}
-				{stepResults}
-				{stepFileSets}
-				{stepMasks}
-				{stepMaskOn}
-				{stepMaskable}
-				onaddstep={addStepAt}
-				ontogglestepmask={toggleStepMaskByIndex}
-				ontextinput={(v) => (textSource = v)}
-				onrendertext={run}
-				onupload={handleFile}
-				onuploadmany={handleFiles}
-				ondownload={download}
+					running={busy}
+					mask={masks.masks[i] ?? null}
+					maskOn={masks.maskOn[i] ?? false}
+					ontogglemask={masks.maskable[i]
+						? () => masks.toggleByIndex(i)
+						: undefined}
 					oncopy={copyText}
 					ondownloadtxt={downloadText}
-				onformat={(v) => (format = v)}
-				onquality={setFormatQuality}
-				onlimit={(v) => (limitKb = v)}
 				/>
+			{:else}
+				{@const outSet = stepFileSets[i] ?? []}
+				<PreviewTile
+					label={t("chain.stepResult", { n: i + 1 })}
+					viewMode="image"
+					dims={out ? `${out.width} × ${out.height}` : undefined}
+					parts={outSet.length > 1 ? outSet.length : undefined}
+				>
+					{#snippet actions()}
+						{@render maskChip(i)}
+					{/snippet}
+					{#if outSet.length > 1 && !masks.maskOn[i]}
+						<PartsGrid files={outSet} />
+					{:else if out}
+						<img
+							src={cachedDataUrl(
+								masks.maskOn[i] && masks.masks[i]
+									? (masks.masks[i] as PixelImage)
+									: out,
+							)}
+							alt=""
+						/>
+					{:else}
+						<span class="empty">{t("resultCard.noResult")}</span>
 					{/if}
+				</PreviewTile>
+			{/if}
+		{/snippet}
+
+		{#snippet panelHead()}
+			<div class="panel-head">
+				<span class="label">{t("resultCard.previewPanel")}</span>
+				{#if resultKind === "image" && steps.length > 1}
+					<label class="align-toggle">
+						<Toggle bind:checked={aligned} label={t("chain.alignToggle")} />
+						<span>{t("chain.alignToggle")}</span>
+					</label>
+				{/if}
+				<SchemaActions
+					{inputMode}
+					resultKind={displayResultKind}
+					canDownload={hasResult}
+					running={busy}
+					format={output.format}
+					quality={output.quality}
+					limitKb={output.limitKb}
+					alphaLoss={output.alphaLoss}
+					onupload={upload.handleFile}
+					ondownload={download}
+					onformat={(v) => (output.format = v)}
+					onquality={output.setQuality}
+					onlimit={(v) => (output.limitKb = v)}
+				/>
+			</div>
+		{/snippet}
+
+		{#snippet addRow(index: number)}
+			{#if canExtend}
+				<div class="add-row">
+					<AddStepButton onadd={(id) => addStepAt(index, id)} />
+					{#if alignedMode}
+						<div class="row-bridge" aria-hidden="true"></div>
+					{/if}
+				</div>
+			{/if}
+		{/snippet}
+
+		<DragDropProvider
+			onDragStart={stepDnd.onDragStart}
+			onDragMove={stepDnd.onDragOver}
+			onDragOver={stepDnd.onDragOver}
+			onDragEnd={stepDnd.onDragEnd}
+		>
+			{#if alignedMode}
+				<div class="workspace aligned">
+					<div class="head-spacer" aria-hidden="true"></div>
+					{@render panelHead()}
+					{@render addRow(0)}
+					{#each steps as step, i (step.key)}
+						{@render stepCard(step, i)}
+						<div class="pair">
+							{@render inputTile(i)}
+							{@render outputTile(i)}
+						</div>
+						{@render addRow(i + 1)}
+					{/each}
+					<div class="panel-foot" aria-hidden="true"></div>
+				</div>
+			{:else}
+				<div class="workspace">
+					<section class="settings">
+						{@render addRow(0)}
+						{#each steps as step, i (step.key)}
+							{@render stepCard(step, i)}
+							{@render addRow(i + 1)}
+						{/each}
+					</section>
+					<section class="panel">
+						{@render panelHead()}
+						<div class="pair-grid">
+							<div class="cell">{@render inputTile(0)}</div>
+							{#each steps as step, i (step.key)}
+								<div class="cell">{@render outputTile(i)}</div>
+							{/each}
+						</div>
+					</section>
+				</div>
+			{/if}
+			{#if errorText}
+				<p class="error" role="alert">{errorText}</p>
+			{/if}
+			{#each allWarnings as w (chainWarningText(w))}
+				<p class="warn" role="status">{chainWarningText(w)}</p>
+			{/each}
+			<StepReorderOverlay {steps} dnd={stepDnd} />
+		</DragDropProvider>
 	</div>
 {:else}
 	<p class="no-schema">{t("paramsCard.noSchema")}</p>
@@ -641,6 +491,11 @@
 		font-size: var(--font-size-s);
 		line-height: 1.5;
 	}
+	/* Two scaffoldings over shared snippets: normal mode keeps two independent
+	   columns (cards pack under each other, tiles pack two per row inside one
+	   panel); aligned mode is a flat 3-column grid where each card shares its
+	   grid row with the input/output pair and the right side reads as one
+	   continuous panel. */
 	.workspace {
 		display: grid;
 		grid-template-columns: minmax(var(--size-workspace-min), 1fr) minmax(
@@ -650,23 +505,143 @@
 		gap: var(--space-xxl);
 		align-items: start;
 	}
+	.settings {
+		display: flex;
+		flex-direction: column;
+	}
 	.panel {
+		padding: var(--space-xl);
 		border: var(--size-border) solid var(--color-border);
 		border-radius: var(--radius-m);
 		background: var(--color-panel);
+	}
+	.panel-head {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		gap: var(--space-m);
+		padding-bottom: var(--space-l);
+		border-bottom: var(--size-border) solid var(--color-border);
+		margin-bottom: var(--space-xl);
+	}
+	.label {
+		font: var(--font-size-s) var(--font-mono);
+		letter-spacing: var(--space-text-l);
+		text-transform: uppercase;
+		color: var(--color-main);
+	}
+	.align-toggle {
+		display: inline-flex;
+		align-items: center;
+		gap: var(--space-m);
+		margin-right: auto;
+		color: var(--color-text-muted);
+		font: var(--font-size-s) var(--font-mono);
+		cursor: pointer;
+	}
+	.pair-grid {
+		display: grid;
+		grid-template-columns: 1fr 1fr;
+		gap: var(--space-l);
+	}
+	.cell {
+		min-width: 0;
+	}
+
+	/* Aligned mode: cards in column 1, each step's input/output pair spans
+	   columns 2-3 on the card's row. The right side forms one panel: head and
+	   foot carry the top/bottom borders, pairs and row bridges carry the side
+	   borders, so rows have no vertical gaps. */
+	.workspace.aligned {
+		grid-template-columns: minmax(var(--size-workspace-min), 1fr) 1fr 1fr;
+		gap: 0 var(--space-xxl);
+	}
+	.aligned > :global(.step-card) {
+		grid-column: 1;
+	}
+	.aligned .head-spacer {
+		grid-column: 1;
+	}
+	.aligned .panel-head {
+		grid-column: 2 / -1;
+		padding: var(--space-l) var(--space-xl);
+		border: var(--size-border) solid var(--color-border);
+		border-bottom: none;
+		border-radius: var(--radius-m) var(--radius-m) 0 0;
+		background: var(--color-panel);
+		margin-bottom: 0;
+	}
+	.aligned .pair {
+		grid-column: 2 / -1;
+		display: grid;
+		grid-template-columns: 1fr 1fr;
+		gap: var(--space-l);
 		padding: var(--space-xl);
+		border-right: var(--size-border) solid var(--color-border);
+		border-left: var(--size-border) solid var(--color-border);
+		background: var(--color-panel);
+	}
+	/* The workspace has align-items: start; panel pieces must stretch to the
+	   row height or the side borders break when a card is taller than its
+	   pair. */
+	.aligned .panel-head,
+	.aligned .pair,
+	.aligned .row-bridge,
+	.aligned .panel-foot {
+		align-self: stretch;
+	}
+	.aligned .add-row {
+		grid-column: 1 / -1;
+		display: grid;
+		grid-template-columns: subgrid;
+	}
+	.aligned .row-bridge {
+		grid-column: 2 / -1;
+		border-right: var(--size-border) solid var(--color-border);
+		border-left: var(--size-border) solid var(--color-border);
+		background: var(--color-panel);
+	}
+	.aligned .panel-foot {
+		grid-column: 2 / -1;
+		min-height: var(--space-xl);
+		border: var(--size-border) solid var(--color-border);
+		border-top: none;
+		border-radius: 0 0 var(--radius-m) var(--radius-m);
+		background: var(--color-panel);
+	}
+	.error {
+		margin: var(--space-l) 0 0;
+		color: var(--color-danger);
+		font: var(--font-size-s) var(--font-mono);
+	}
+	.empty {
+		font: var(--font-size-s) var(--font-mono);
 	}
 	.no-schema {
 		font: var(--font-size-s) var(--font-mono);
 	}
 	.warn {
-		margin: 0;
+		margin: var(--space-s) 0 0;
 		color: var(--color-warning);
 		font: var(--font-size-s) var(--font-mono);
 	}
 	@media (--bp-tablet) {
-		.workspace {
+		.workspace,
+		.workspace.aligned {
 			grid-template-columns: 1fr;
 		}
+		.pair-grid,
+		.aligned .pair {
+			grid-template-columns: 1fr;
+		}
+		.aligned .head-spacer,
+		.aligned .row-bridge {
+			display: none;
+		}
+		.aligned .panel-head,
+		.aligned .pair,
+		.aligned .panel-foot {
+			grid-column: 1 / -1;
+		}
 	}
 </style>

web/src/lib/components/schema/SortableStepCard.svelte

@@ -0,0 +1,58 @@
+<script lang="ts">
+	import StepCard from "$lib/components/display/StepCard.svelte";
+	import type { ChainStep } from "$lib/pipeline.svelte";
+	import { createSortable } from "@dnd-kit/svelte/sortable";
+	import type { Snippet } from "svelte";
+
+	interface Props {
+		step: ChainStep;
+		index: number;
+		title: string;
+		collapsed?: boolean;
+		tools?: Snippet;
+		children?: Snippet;
+		onremove?: () => void;
+		ontoggle?: () => void;
+	}
+
+	let {
+		step,
+		index,
+		title,
+		collapsed = false,
+		tools,
+		children,
+		onremove,
+		ontoggle,
+	}: Props = $props();
+
+	// feedback: "none" -- no transform shifting; step-dnd.svelte.ts hides the
+	// source and renders a dashed drop indicator instead.
+	const sortable = createSortable({
+		get id() {
+			return step.key;
+		},
+		get index() {
+			return index;
+		},
+		group: "steps",
+		type: "step",
+		accept: "step",
+		feedback: "none",
+		get data() {
+			return { title };
+		},
+	});
+</script>
+
+<StepCard
+	index={index + 1}
+	{title}
+	{collapsed}
+	{tools}
+	{children}
+	{onremove}
+	{ontoggle}
+	elementAttachment={sortable.attach}
+	handleAttachment={sortable.attachHandle}
+/>

web/src/lib/components/schema/StepReorderOverlay.svelte

@@ -0,0 +1,125 @@
+<script lang="ts">
+	import { chainStepTitle } from "$lib/i18n/schema-tool-strings";
+	import type { ChainStep } from "$lib/pipeline.svelte";
+	import { GripVertical } from "@lucide/svelte";
+	import type { StepDnd } from "./step-dnd.svelte";
+
+	interface Props {
+		steps: ChainStep[];
+		dnd: StepDnd;
+	}
+	let { steps, dnd }: Props = $props();
+
+	let listEl = $state<HTMLElement | null>(null);
+	$effect(() => {
+		dnd.registerList(listEl);
+		return () => dnd.registerList(null);
+	});
+
+	// Align the overlay so its source row sits exactly under the cursor (the
+	// dragged card's grab point); the page behind never moves.
+	const top = $derived.by(() => {
+		const anchor = dnd.anchor;
+		const el = listEl;
+		if (!anchor || !el || steps.length === 0) return null;
+		const rowH = el.scrollHeight / steps.length;
+		const offsetInSource = anchor.startY - anchor.sourceTop;
+		const raw = anchor.startY - (dnd.sourceIndex ?? 0) * rowH - offsetInSource;
+		const margin = 16;
+		const maxTop = window.innerHeight - el.offsetHeight - margin;
+		return Math.min(Math.max(raw, margin), Math.max(margin, maxTop));
+	});
+
+	const lineTop = $derived.by(() => {
+		const slot = dnd.indicatorSlot;
+		const el = listEl;
+		if (slot === null || !el || steps.length === 0) return null;
+		const rowH = el.scrollHeight / steps.length;
+		return slot * rowH - el.scrollTop;
+	});
+</script>
+
+{#if dnd.activeData && dnd.anchor}
+	<div class="reorder-scrim" aria-hidden="true"></div>
+	<div
+		class="reorder-overlay"
+		style:left="{dnd.anchor.left}px"
+		style:top="{top ?? dnd.anchor.sourceTop}px"
+		style:width="{dnd.anchor.width}px"
+		style:visibility={top === null ? "hidden" : "visible"}
+	>
+		<ol class="reorder-list" bind:this={listEl}>
+			{#each steps as step, i (step.key)}
+				<li class:dimmed={i === dnd.sourceIndex}>
+					<GripVertical size={14} aria-hidden="true" />
+					<span class="reorder-index">{String(i + 1).padStart(2, "0")}</span>
+					<span class="reorder-title">{chainStepTitle(step.id)}</span>
+				</li>
+			{/each}
+		</ol>
+		{#if lineTop !== null}
+			<div class="reorder-line" style:top="{lineTop}px"></div>
+		{/if}
+	</div>
+{/if}
+
+<style>
+	/* The scrim dims the page so the floating list does not blend into the
+	   step cards underneath; it never intercepts the drag. */
+	.reorder-scrim {
+		position: fixed;
+		inset: 0;
+		z-index: var(--z-dropdown);
+		background: var(--color-scrim);
+		pointer-events: none;
+	}
+	.reorder-overlay {
+		position: fixed;
+		z-index: var(--z-drag);
+		display: flex;
+		flex-direction: column;
+		overflow: hidden;
+		max-height: 60vh;
+		border: var(--size-border-thick) solid var(--color-main);
+		background: var(--color-panel);
+	}
+	.reorder-list {
+		margin: 0;
+		padding: 0;
+		list-style: none;
+		overflow-y: auto;
+	}
+	.reorder-list li {
+		display: flex;
+		align-items: center;
+		gap: var(--space-m);
+		padding: var(--space-s) var(--space-l);
+		border-bottom: var(--size-border) solid var(--color-border);
+		color: var(--color-border);
+		white-space: nowrap;
+	}
+	.reorder-list li:last-child {
+		border-bottom: none;
+	}
+	.reorder-list li.dimmed {
+		opacity: 0.45;
+	}
+	.reorder-index {
+		font: var(--font-size-s) var(--font-mono);
+		color: var(--color-main);
+	}
+	.reorder-title {
+		overflow: hidden;
+		text-overflow: ellipsis;
+		font: 600 var(--font-size-m) var(--font-mono);
+		color: var(--color-text);
+	}
+	.reorder-line {
+		position: absolute;
+		right: 0;
+		left: 0;
+		height: var(--size-border-thick);
+		background: var(--color-main);
+		pointer-events: none;
+	}
+</style>

web/src/lib/components/schema/chain-host.svelte.ts

@@ -0,0 +1,139 @@
+import { goto } from "$app/navigation";
+import { resolve } from "$app/paths";
+import {
+	autoChainName,
+	createNamedChain,
+	getChain,
+	stashHandoff,
+	takeHandoff,
+	updateChainSteps,
+} from "$lib/chains.svelte";
+import type { OutputMime } from "$lib/core/io";
+import type { PixelImage } from "$lib/core/types";
+import {
+	createChain,
+	isStructuralDefault,
+	type ChainStep,
+} from "$lib/pipeline.svelte";
+import type { Page, Tool, ToolImageFile } from "$lib/registry";
+import type { ToolSchema } from "$lib/registry-schema";
+import { baseName } from "$lib/run-chain";
+
+interface SourceLike {
+	source: PixelImage | null;
+	sourceFiles: ToolImageFile[];
+	textSource: string;
+	clearWarnings: () => void;
+}
+
+interface OutputLike {
+	format: OutputMime;
+	limitKb: number | undefined;
+}
+
+export interface ChainHostCtx {
+	page: () => Page;
+	chainId: () => string | undefined;
+	schema: () => ToolSchema<Record<string, unknown>> | undefined;
+	lastTool: () => Tool;
+	steps: () => ChainStep[];
+	stepState: { steps: ChainStep[]; clearMarks: () => void };
+	source: SourceLike;
+	output: OutputLike;
+	// Drops run state and invalidates any in-flight run from the previous host.
+	resetRun: () => void;
+	clearMasks: () => void;
+}
+
+// Host lifecycle of SchemaToolView: per-host init (plain tool page vs named
+// chain), handoff across the tool -> pipeline route swap, autosave into the
+// chains store and the explicit "save as chain" action.
+export function createChainHost(ctx: ChainHostCtx) {
+	let initedFor = $state("");
+
+	function init() {
+		if (!ctx.schema()) return;
+		const chainId = ctx.chainId();
+		const host = chainId ? `chain:${chainId}` : ctx.page().slug;
+		if (host === initedFor) return;
+		initedFor = host;
+		ctx.resetRun();
+		if (chainId) {
+			const handoff = takeHandoff(chainId);
+			ctx.stepState.steps = getChain(chainId)?.steps ?? createChain(ctx.page());
+			ctx.source.source = handoff?.source ?? null;
+			ctx.source.sourceFiles =
+				handoff?.sourceFiles ??
+				(handoff?.source
+					? [
+							{
+								name: `${baseName(ctx.page().slug)}.png`,
+								image: handoff.source,
+							},
+						]
+					: []);
+			ctx.source.textSource = handoff?.textSource ?? "";
+			ctx.output.format =
+				handoff?.format ?? ctx.lastTool().output?.mime ?? "image/png";
+			ctx.output.limitKb = handoff?.limitKb;
+		} else {
+			ctx.stepState.steps = createChain(ctx.page());
+			ctx.output.format = ctx.lastTool().output?.mime ?? "image/png";
+			ctx.output.limitKb = undefined;
+			ctx.source.source = null;
+			ctx.source.sourceFiles = [];
+			ctx.source.textSource = "";
+		}
+		ctx.source.clearWarnings();
+		ctx.clearMasks();
+		ctx.stepState.clearMarks();
+	}
+
+	function openChain(steps: ChainStep[]) {
+		const chain = createNamedChain(autoChainName(), steps);
+		stashHandoff(chain.id, {
+			source: ctx.source.source,
+			sourceFiles: ctx.source.sourceFiles,
+			textSource: ctx.source.textSource,
+			format: ctx.output.format,
+			limitKb: ctx.output.limitKb,
+		});
+		goto(resolve(`/pipeline?id=${chain.id}`), {
+			replaceState: true,
+			keepFocus: true,
+			noScroll: true,
+		});
+	}
+
+	$effect(() => {
+		init();
+	});
+
+	// Named-chain mode autosaves into the chains store; a plain tool page
+	// persists nothing -- it becomes a named chain on structural change below.
+	$effect(() => {
+		const chainId = ctx.chainId();
+		if (!initedFor || !chainId) return;
+		void ctx.steps();
+		updateChainSteps(chainId, ctx.steps());
+	});
+
+	// A tool page turns into a pipeline on the first structural change (step
+	// added, first tool swapped): create the named chain and swap routes
+	// seamlessly -- steps persist via the store, the source via the handoff.
+	$effect(() => {
+		if (!initedFor || ctx.chainId()) return;
+		void ctx.steps();
+		if (isStructuralDefault(ctx.page(), ctx.steps())) return;
+		openChain(ctx.steps());
+	});
+
+	return {
+		get inited() {
+			return initedFor !== "";
+		},
+		// Explicit save for a structurally default chain (single tuned step):
+		// the auto-create effect only fires on structural change.
+		saveAsChain: () => openChain(ctx.steps()),
+	};
+}

web/src/lib/components/schema/output-controls.svelte.ts

@@ -0,0 +1,71 @@
+import { hasTransparency } from "$lib/core/analyze";
+import type { OutputMime } from "$lib/core/io";
+import type { PixelImage } from "$lib/core/types";
+import { outputFormatByMime } from "$lib/output-formats";
+import type { ChainStep } from "$lib/pipeline.svelte";
+import type { Tool } from "$lib/registry";
+
+export interface OutputControlsCtx {
+	lastTool: () => Tool;
+	steps: () => ChainStep[];
+	result: () => PixelImage | null;
+	setStepValue: (index: number, id: string, value: unknown) => void;
+}
+
+// Download controls of SchemaToolView: output format, lossy quality and the
+// optional size limit, plus the alpha-loss warning for the current format.
+export function createOutputControls(ctx: OutputControlsCtx) {
+	let format = $state<OutputMime>("image/png");
+	// Lossy-format quality for tools without a quality param in the schema.
+	let formatQuality = $state<Record<string, number>>({});
+	// Optional download size limit (KB); undefined = no limit.
+	let limitKb = $state<number | undefined>(undefined);
+
+	// If the last step's schema has a quality param (convert tools), it is the
+	// single source of quality; the dropdown edits the same value.
+	const qualityParamId = $derived(ctx.lastTool().output?.qualityParamId);
+	const lastParams = $derived(ctx.steps().at(-1)?.params);
+	const quality = $derived.by(() => {
+		const setting = outputFormatByMime(format).settings?.quality;
+		if (!setting) return undefined;
+		if (qualityParamId && lastParams) return Number(lastParams[qualityParamId]);
+		return formatQuality[format] ?? setting.default;
+	});
+	const alphaLoss = $derived.by(() => {
+		const result = ctx.result();
+		return (
+			(ctx.lastTool().result ?? "image") === "image" &&
+			result !== null &&
+			!outputFormatByMime(format).supportsAlpha &&
+			hasTransparency(result)
+		);
+	});
+
+	return {
+		get format() {
+			return format;
+		},
+		set format(v: OutputMime) {
+			format = v;
+		},
+		get quality() {
+			return quality;
+		},
+		get limitKb() {
+			return limitKb;
+		},
+		set limitKb(v: number | undefined) {
+			limitKb = v;
+		},
+		get alphaLoss() {
+			return alphaLoss;
+		},
+		setQuality: (q: number) => {
+			if (qualityParamId) {
+				ctx.setStepValue(ctx.steps().length - 1, qualityParamId, q);
+			} else {
+				formatQuality = { ...formatQuality, [format]: q };
+			}
+		},
+	};
+}

web/src/lib/components/schema/schema-tool-state.svelte.ts

@@ -2,7 +2,6 @@ import type { PixelImage } from "$lib/core/types";
 import {
 	createStep,
 	insertStep,
-	moveStep,
 	removeStep,
 	type ChainStep,
 } from "$lib/pipeline.svelte";
@@ -23,7 +22,6 @@ export interface SchemaToolStateCtx {
 
 interface StepsState {
 	steps: ChainStep[];
-	dragFrom: number | null;
 }
 
 export function toolSchemaOf(step: ChainStep) {
@@ -122,7 +120,7 @@ function touchedFor(marks: Marks, key: string): SvelteSet<string> {
 // Chain-step state of SchemaToolView: the steps array, per-step edit marks
 // and all mutations. Results/execution live in schema-tool-runner.svelte.ts.
 export function createSchemaToolState(ctx: SchemaToolStateCtx) {
-	const s = $state<StepsState>({ steps: [], dragFrom: null });
+	const s = $state<StepsState>({ steps: [] });
 	const marks: Marks = {
 		touchedByStep: new SvelteMap(),
 		lastAxis: {},
@@ -134,12 +132,6 @@ export function createSchemaToolState(ctx: SchemaToolStateCtx) {
 		set steps(v: ChainStep[]) {
 			s.steps = v;
 		},
-		get dragFrom() {
-			return s.dragFrom;
-		},
-		set dragFrom(v: number | null) {
-			s.dragFrom = v;
-		},
 		touchedFor: (key: string) => touchedFor(marks, key),
 		// Marks are keyed by step.key from the previous host; keep them and
 		// stale keys leak into the new chain's fields.
@@ -181,10 +173,5 @@ export function createSchemaToolState(ctx: SchemaToolStateCtx) {
 				collapsed: step.collapsed,
 			});
 		},
-		onStepDrop: (e: DragEvent, to: number) => {
-			e.preventDefault();
-			if (s.dragFrom !== null) s.steps = moveStep(s.steps, s.dragFrom, to);
-			s.dragFrom = null;
-		},
 	};
 }

web/src/lib/components/schema/source-upload.svelte.ts

@@ -0,0 +1,130 @@
+import { ToolError } from "$lib/core/errors";
+import { decodeFile } from "$lib/core/io";
+import type { PixelImage } from "$lib/core/types";
+import type { ChainStep } from "$lib/pipeline.svelte";
+import type { InputMode, ToolImageFile } from "$lib/registry";
+import {
+	applySourceDefaults,
+	clampSourceAwareMaxes,
+} from "$lib/registry-schema";
+import { baseName, uniqueName, type ChainWarning } from "$lib/run-chain";
+import { onMount } from "svelte";
+import type { SvelteSet } from "svelte/reactivity";
+import { toolSchemaOf } from "./schema-tool-state.svelte";
+
+export interface SourceUploadCtx {
+	inputMode: () => InputMode;
+	steps: () => ChainStep[];
+	setSteps: (steps: ChainStep[]) => void;
+	touchedFor: (key: string) => SvelteSet<string>;
+	reportError: (e: unknown) => void;
+	clearError: () => void;
+}
+
+// Source state of SchemaToolView: image files / text input, decode warnings,
+// paste-to-load. `source` is the first image for preview/defaults;
+// `sourceFiles` is the full named input set (single upload = one element).
+export function createSourceUpload(ctx: SourceUploadCtx) {
+	let source = $state<PixelImage | null>(null);
+	let sourceFiles = $state<ToolImageFile[]>([]);
+	let textSource = $state("");
+	let sourceWarnings = $state<ChainWarning[]>([]);
+
+	async function handleFiles(files: File[]) {
+		ctx.clearError();
+		sourceWarnings = [];
+		const decoded: ToolImageFile[] = [];
+		const usedNames = new Set<string>();
+		let skipped = 0;
+		for (const file of files) {
+			try {
+				const name = uniqueName(`${baseName(file.name)}.png`, usedNames);
+				usedNames.add(name);
+				decoded.push({ name, image: await decodeFile(file) });
+			} catch {
+				skipped++;
+			}
+		}
+		if (decoded.length === 0) {
+			ctx.reportError(new ToolError("errors.imageDecode"));
+			return;
+		}
+		if (skipped > 0) {
+			sourceWarnings = [{ kind: "sourceSkip", skipped, total: files.length }];
+		}
+		const firstImage = decoded[0].image;
+		source = firstImage;
+		sourceFiles = decoded;
+		const first = ctx.steps()[0];
+		const firstSchema = first ? toolSchemaOf(first) : undefined;
+		if (first && firstSchema) {
+			ctx.setSteps(
+				ctx.steps().with(0, {
+					...first,
+					params: clampSourceAwareMaxes(
+						firstSchema,
+						applySourceDefaults(
+							firstSchema,
+							first.params,
+							{ source: firstImage },
+							ctx.touchedFor(first.key),
+						),
+						firstImage,
+					),
+				}),
+			);
+		}
+	}
+
+	async function handleFile(file: File) {
+		await handleFiles([file]);
+	}
+
+	onMount(() => {
+		if (ctx.inputMode() !== "image") return;
+		function onPaste(e: ClipboardEvent) {
+			const target = e.target as HTMLElement | null;
+			if (target?.closest("input, textarea, [contenteditable]")) return;
+			for (const item of e.clipboardData?.items ?? []) {
+				if (item.kind !== "file" || !item.type.startsWith("image/")) continue;
+				const file = item.getAsFile();
+				if (file) {
+					e.preventDefault();
+					void handleFile(file);
+				}
+				return;
+			}
+		}
+		window.addEventListener("paste", onPaste);
+		return () => window.removeEventListener("paste", onPaste);
+	});
+
+	return {
+		get source() {
+			return source;
+		},
+		set source(v: PixelImage | null) {
+			source = v;
+		},
+		get sourceFiles() {
+			return sourceFiles;
+		},
+		set sourceFiles(v: ToolImageFile[]) {
+			sourceFiles = v;
+		},
+		get textSource() {
+			return textSource;
+		},
+		set textSource(v: string) {
+			textSource = v;
+		},
+		get sourceWarnings() {
+			return sourceWarnings;
+		},
+		clearWarnings: () => {
+			sourceWarnings = [];
+		},
+		handleFile,
+		handleFiles,
+	};
+}

web/src/lib/components/schema/step-dnd.svelte.ts

@@ -0,0 +1,122 @@
+import type { Draggable } from "@dnd-kit/dom";
+import { isSortable } from "@dnd-kit/dom/sortable";
+
+export interface StepDragData {
+	title: string;
+}
+
+interface StepDndOptions {
+	// Compressed-index semantics: `to` counts items with the source excluded,
+	// matching moveStep's remove-then-insert.
+	onMove: (from: number, to: number) => void;
+}
+
+interface DndEvent {
+	operation?: {
+		source?: Draggable | null;
+		position?: { current?: { x: number; y: number } } | null;
+	};
+	canceled?: boolean;
+}
+
+export interface StepDragAnchor {
+	left: number;
+	width: number;
+	// Pointer Y and the source card's top at drag start: the overlay aligns
+	// its source row under the cursor.
+	startY: number;
+	sourceTop: number;
+}
+
+// Step-reorder state for SchemaToolView. Dragging a card handle opens a
+// compact overlay list (StepReorderOverlay) instead of reshaping the page:
+// the page keeps its layout and scroll position, drop targeting is computed
+// against the overlay rows.
+export function createStepDnd({ onMove }: StepDndOptions) {
+	let activeData = $state<StepDragData | null>(null);
+	let indicatorSlot = $state<number | null>(null);
+	let sourceIndex = $state<number | null>(null);
+	let anchor = $state<StepDragAnchor | null>(null);
+	let listEl: HTMLElement | null = null;
+
+	// Slot in full-list coordinates: how many overlay rows have their midpoint
+	// above the pointer. Rows are uniform single-line height.
+	function slotAt(position: { x: number; y: number }): number | null {
+		const el = listEl;
+		if (!el || el.childElementCount === 0) return null;
+		const rect = el.getBoundingClientRect();
+		if (position.x < rect.left || position.x > rect.right) return null;
+		const count = el.childElementCount;
+		const rowH = el.scrollHeight / count;
+		if (rowH <= 0) return null;
+		const offsetY = position.y - rect.top + el.scrollTop;
+		const slot = Math.floor(offsetY / rowH + 0.5);
+		return Math.min(Math.max(slot, 0), count);
+	}
+
+	function onDragStart(event: DndEvent) {
+		const source = event.operation?.source;
+		if (!source) return;
+		activeData = (source.data as StepDragData | undefined) ?? null;
+		if (isSortable(source)) sourceIndex = source.sortable.initialIndex;
+		const el = source.element as HTMLElement | undefined;
+		const rect = el?.getBoundingClientRect();
+		const position = event.operation?.position?.current;
+		if (rect) {
+			anchor = {
+				left: rect.left,
+				width: rect.width,
+				startY: position?.y ?? rect.top + rect.height / 2,
+				sourceTop: rect.top,
+			};
+		}
+	}
+
+	function onDragOver(event: DndEvent) {
+		const position = event.operation?.position?.current;
+		indicatorSlot = position ? slotAt(position) : null;
+	}
+
+	function onDragEnd(event: DndEvent) {
+		const position = event.operation?.position?.current;
+		const slot = event.canceled || !position ? null : slotAt(position);
+		const from = sourceIndex;
+		activeData = null;
+		indicatorSlot = null;
+		sourceIndex = null;
+		anchor = null;
+		if (from === null || slot === null) return;
+		// Slots include the source row; moveStep wants the compressed index.
+		const to = slot > from ? slot - 1 : slot;
+		if (to === from) return;
+		onMove(from, to);
+	}
+
+	function registerList(el: HTMLElement | null) {
+		listEl = el;
+	}
+
+	return {
+		get activeData() {
+			return activeData;
+		},
+		get active() {
+			return activeData !== null;
+		},
+		get indicatorSlot() {
+			return indicatorSlot;
+		},
+		get sourceIndex() {
+			return sourceIndex;
+		},
+		get anchor() {
+			return anchor;
+		},
+		onDragStart,
+		onDragOver,
+		onDragEnd,
+		registerList,
+	};
+}
+
+export type StepDnd = ReturnType<typeof createStepDnd>;

web/src/lib/components/schema/step-mask.svelte.ts

@@ -0,0 +1,59 @@
+import type { PixelImage } from "$lib/core/types";
+import type { ChainStep } from "$lib/pipeline.svelte";
+import { getTool } from "$lib/registry";
+import { sanitizeSchemaParams } from "$lib/registry-schema";
+import { SvelteSet } from "svelte/reactivity";
+import { toolSchemaOf } from "./schema-tool-state.svelte";
+
+export interface StepMasksCtx {
+	steps: () => ChainStep[];
+	source: () => PixelImage | null;
+	stepResults: () => (PixelImage | null)[];
+}
+
+// Per-step mask preview of SchemaToolView: the toggle lives on every step
+// result tile (keyed by step.key), the mask never enters the chain itself.
+export function createStepMasks(ctx: StepMasksCtx) {
+	const onKeys = new SvelteSet<string>();
+	// Recomputed on the main thread per toggled step from that step's input.
+	const results = $derived.by(() => {
+		const next: Record<string, PixelImage | null> = {};
+		ctx.steps().forEach((step, i) => {
+			if (!onKeys.has(step.key)) return;
+			const stepTool = getTool(step.id);
+			if (!stepTool?.runMask) return;
+			const input = i === 0 ? ctx.source() : ctx.stepResults()[i - 1];
+			if (!input) return;
+			// Same contract as executor.ts: params are sanitized against the
+			// schema with the step input as the source context.
+			const stepSchema = toolSchemaOf(step);
+			const params = stepSchema
+				? sanitizeSchemaParams(stepSchema, step.params, { source: input })
+				: step.params;
+			try {
+				next[step.key] = stepTool.runMask({ params, source: input });
+			} catch {
+				next[step.key] = null;
+			}
+		});
+		return next;
+	});
+	return {
+		get maskable() {
+			return ctx.steps().map((s) => !!getTool(s.id)?.runMask);
+		},
+		get maskOn() {
+			return ctx.steps().map((s) => onKeys.has(s.key));
+		},
+		get masks() {
+			return ctx.steps().map((s) => results[s.key] ?? null);
+		},
+		toggleByIndex: (i: number) => {
+			const step = ctx.steps()[i];
+			if (!step) return;
+			if (onKeys.has(step.key)) onKeys.delete(step.key);
+			else onKeys.add(step.key);
+		},
+		clear: () => onKeys.clear(),
+	};
+}

web/src/lib/core/io.ts

@@ -82,6 +82,21 @@ export function toBase64(img: PixelImage): string {
 	return toDataUrl(img).slice("data:image/png;base64,".length);
 }
 
+const dataUrlCache = new WeakMap<PixelImage, string>();
+
+// Display helper: PNG-encode on the main thread is expensive and templates
+// re-render often with the same image (layout branch swaps, toggles). Results
+// are treated as immutable -- a re-run produces new objects -- so an
+// identity-keyed cache cannot go stale.
+export function cachedDataUrl(img: PixelImage): string {
+	let url = dataUrlCache.get(img);
+	if (url === undefined) {
+		url = toDataUrl(img);
+		dataUrlCache.set(img, url);
+	}
+	return url;
+}
+
 export async function decodeTextImage(text: string): Promise<PixelImage> {
 	const cleaned = text.trim().replace(/^data:[^,]*,/, "");
 	if (cleaned.length === 0) {

web/src/lib/i18n/schema-tool-strings.ts

@@ -1,5 +1,6 @@
 import type { Page } from "$lib/registry";
 import { PAGES } from "../registry";
+import type { ChainWarning } from "$lib/run-chain";
 import type { Field } from "$lib/registry-schema";
 import { getMergedDict } from "./locale.svelte";
 import { normalizeForSearch, scoreDoc, type SearchDoc } from "./matching";
@@ -67,6 +68,21 @@ export function verdictTone(key: string): "success" | "danger" | "info" {
 	return "info";
 }
 
+/** Human-readable text for a chain run/source warning. */
+export function chainWarningText(w: ChainWarning): string {
+	switch (w.kind) {
+		case "partial":
+			return t("chain.warnPartial", { n: w.step, ok: w.ok, total: w.total });
+		case "firstOnly":
+			return t("chain.warnFirstOnly", { n: w.step, total: w.total });
+		case "sourceSkip":
+			return t("chain.warnSourceSkip", {
+				skipped: w.skipped,
+				total: w.total,
+			});
+	}
+}
+
 function dedupe(values: string[]): string[] {
 	return [...new Set(values.filter((v) => v.length > 0))];
 }