refactor: reorganize components

src/components/panel/PanelList.svelte

@@ -3,7 +3,7 @@
   import { panelStore } from "../../stores/panelStore";
   import { panelStorage } from "$lib/utils/panelStorage";
   import type { Panel } from "$lib/types/panel";
-  import { IconButton } from "$lib/components/ui";
+  import IconButton from "../ui/IconButton.svelte";
 
   interface Props {
     onPanelSelect: (panel: Panel) => void;

src/components/panel/PanelPreview.svelte

@@ -4,7 +4,7 @@
 
   type TextItem = Panel["texts"][0];
   import { Stage, Layer, Image, Text } from "svelte-konva";
-  import { Button } from "$lib/components/ui";
+  import Button from "../ui/Button.svelte";
 
   interface Props {
     panel: Panel;

src/components/panel/PanelsList.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import type { Panel } from "$lib/types/panel";
   import PanelPreview from "./PanelPreview.svelte";
-  import { Button } from "$lib/components/ui";
+  import Button from "../ui/Button.svelte";
 
   interface Props {
     panels: Panel[];