# Phase 2: Drag-and-Drop Reordering

**Status:** ⬜ Not Started
**Parent plan:** [PLAN.md](./PLAN.md)
**Domain:** frontend

## Objective
Add drag-and-drop reordering for sections within boards and widgets within/across sections using svelte-dnd-action.

## Tasks

- [ ] Task 1: Install `svelte-dnd-action` package
- [ ] Task 2: Create `src/lib/components/board/DraggableBoard.svelte` — board with draggable sections
- [ ] Task 3: Create `src/lib/components/section/DraggableSection.svelte` — section with draggable widgets
- [ ] Task 4: Create `src/lib/components/widget/DraggableWidget.svelte` — draggable widget wrapper
- [ ] Task 5: Update `src/routes/boards/[boardId]/edit/+page.svelte` — replace static editor with DnD editor
- [ ] Task 6: Create `src/routes/api/boards/[id]/reorder/+server.ts` — API to persist section order changes
- [ ] Task 7: Create `src/routes/api/boards/[id]/sections/[sid]/reorder/+server.ts` — API to persist widget order changes
- [ ] Task 8: Update `src/lib/server/services/boardService.ts` — add `reorderSections()` and `reorderWidgets()` functions
- [ ] Task 9: Add visual drag handles and drop zone indicators
- [ ] Task 10: Support moving widgets between sections via cross-section DnD

## Files to Modify/Create
- `package.json` — add svelte-dnd-action
- `src/lib/components/board/DraggableBoard.svelte` — NEW
- `src/lib/components/section/DraggableSection.svelte` — NEW
- `src/lib/components/widget/DraggableWidget.svelte` — NEW
- `src/routes/boards/[boardId]/edit/+page.svelte` — MODIFY
- `src/routes/api/boards/[id]/reorder/+server.ts` — NEW
- `src/routes/api/boards/[id]/sections/[sid]/reorder/+server.ts` — NEW
- `src/lib/server/services/boardService.ts` — MODIFY

## Acceptance Criteria
- Sections can be reordered via drag-and-drop in the board editor
- Widgets can be reordered within a section
- Widgets can be moved between sections
- Order changes persist via API calls
- Drag handles are visible and accessible
- Drop zones are visually indicated during drag

## Notes
- `svelte-dnd-action` works well with Svelte 5
- Use optimistic updates — reorder in UI immediately, sync to server in background
- Reorder APIs should accept an array of IDs in the new order
- ⚠️ Big Bang: may need integration fixes in Phase 5

## Review Checklist
- [ ] All tasks completed
- [ ] Code follows project conventions
- [ ] No unintended side effects
- [ ] Build passes
- [ ] Tests pass (new + existing)

## Handoff to Next Phase
<!-- Filled in by the implementation agent after completing this phase. -->