feat: add dashboard ui view

docs/PLAN.md

@@ -56,7 +56,9 @@ src/
 │   └── taskCommands.ts          # register + run* handlers
 ├── views/
 │   ├── taskTreeItem.ts
-│   └── taskTreeProvider.ts
+│   ├── taskTreeProvider.ts
+│   ├── taskDashboardPanel.ts    # WebviewPanel host
+│   └── taskDashboardHtml.ts     # split layout document
 └── utils/
 
 tests/helpers/InMemoryFileSystem.ts
@@ -102,13 +104,13 @@ Split layout: список (filter/group) + detail (editable markdown body).
 | `loadDashboard`                | folder → `{ tasks }`; `AppError.NO_FOLDER`                                       |
 | `saveTaskDescription`          | folder + id + description → update body; `NOT_FOUND` / validation                |
 
-**Unit-тестами не покрываем** (нужен Extension Host / DOM WebView):
+**Host (сделано, unit-тестами не покрываем):**
 
-- `WebviewPanel` create/dispose, HTML/CSS split layout, CSP / local resources
-- `postMessage` wiring host ↔ webview (кроме parse inbound payload)
-- регистрация `projectTasks.openDashboard`, status bar → open panel
-- live refresh watcher → push в webview
-- визуальный рендер списка/редактора в editor area
+- `TaskDashboardPanel` — create/reveal/dispose, state, inbound/outbound
+- HTML split: filter/group/list | detail + save description
+- `openDashboard` + status bar; watcher / command mutations → `refreshIfOpen`
+
+**По-прежнему только smoke руками:** визуал, CSP, postMessage round-trip
 
 ## Зависимости