feat(KB-048): add collapsible list sections to dashboard

- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior

packages/dashboard/package.json

@@ -19,6 +19,7 @@
     "build": "vite build && tsc",
     "build:client": "vite build",
     "dev": "vite build --watch",
+    "test": "vitest run",
     "typecheck": "tsc --noEmit && tsc --noEmit -p tsconfig.app.json"
   },
   "dependencies": {
@@ -35,15 +36,17 @@
   "devDependencies": {
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.5.0",
     "@types/express": "^5.0.0",
     "@types/node": "^22.0.0",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.0",
+    "@vitest/coverage-v8": "^3.1.0",
     "jsdom": "^29.0.1",
     "typescript": "^5.7.0",
     "vite": "^6.0.0",
-    "vitest": "^4.1.1"
+    "vitest": "^3.1.0"
   },
   "private": true
 }