feat(phase2): per-board access control UI

- BoardAccessControl component with user/group autocomplete
- BoardShareDialog modal with copy link, guest toggle, quick add
- Board permissions REST API (GET/POST/DELETE)
- Access indicators on BoardCard (lock, globe, shared icons)
- Guest access toggle in board editor with status preview
- Enhanced PermissionEditor with search autocomplete
- i18n translations for all new strings (EN/RU)

plans/phase-2-enhanced-features/phase-5-access-control.md

@@ -1,6 +1,6 @@
 # Phase 4: Per-Board Access Control UI
 
-**Status:** ⬜ Not Started
+**Status:** Done
 **Parent plan:** [PLAN.md](./PLAN.md)
 **Domain:** fullstack
 
@@ -9,14 +9,14 @@ Add a user-friendly access control interface for boards, allowing admins to mana
 
 ## Tasks
 
-- [ ] Task 1: Create `src/lib/components/board/BoardAccessControl.svelte` — inline permission editor for boards
-- [ ] Task 2: Add access control tab/section to board editor page
-- [ ] Task 3: Create `src/routes/api/boards/[id]/permissions/+server.ts` — GET/POST/DELETE permissions for a board
-- [ ] Task 4: Update `src/lib/components/admin/PermissionEditor.svelte` — enhance with user/group search/autocomplete
-- [ ] Task 5: Update `src/lib/components/board/BoardCard.svelte` — show access level indicator (icon/badge)
-- [ ] Task 6: Update `src/routes/boards/+page.svelte` — show access indicators on board list
-- [ ] Task 7: Add guest access toggle with preview description to board editor
-- [ ] Task 8: Create `src/lib/components/board/BoardShareDialog.svelte` — quick share dialog for boards
+- [x] Task 1: Create `src/lib/components/board/BoardAccessControl.svelte` — inline permission editor for boards
+- [x] Task 2: Add access control tab/section to board editor page
+- [x] Task 3: Create `src/routes/api/boards/[id]/permissions/+server.ts` — GET/POST/DELETE permissions for a board
+- [x] Task 4: Update `src/lib/components/admin/PermissionEditor.svelte` — enhance with user/group search/autocomplete
+- [x] Task 5: Update `src/lib/components/board/BoardCard.svelte` — show access level indicator (icon/badge)
+- [x] Task 6: Update `src/routes/boards/+page.svelte` — show access indicators on board list
+- [x] Task 7: Add guest access toggle with preview description to board editor
+- [x] Task 8: Create `src/lib/components/board/BoardShareDialog.svelte` — quick share dialog for boards
 
 ## Files to Modify/Create
 - `src/lib/components/board/BoardAccessControl.svelte` — NEW
@@ -26,7 +26,12 @@ Add a user-friendly access control interface for boards, allowing admins to mana
 - `src/routes/boards/[boardId]/edit/+page.server.ts` — MODIFY
 - `src/lib/components/admin/PermissionEditor.svelte` — MODIFY
 - `src/lib/components/board/BoardCard.svelte` — MODIFY
-- `src/routes/boards/+page.svelte` — MODIFY
+- `src/routes/boards/+page.svelte` — MODIFY (server only — +page.server.ts)
+- `src/routes/boards/[boardId]/+page.svelte` — MODIFY
+- `src/routes/boards/[boardId]/+page.server.ts` — MODIFY
+- `src/lib/components/board/BoardHeader.svelte` — MODIFY
+- `src/lib/i18n/en.json` — MODIFY
+- `src/lib/i18n/ru.json` — MODIFY
 
 ## Acceptance Criteria
 - Board editor has a permissions section for managing access
@@ -38,14 +43,24 @@ Add a user-friendly access control interface for boards, allowing admins to mana
 ## Notes
 - The permission system already exists from MVP (permissionService)
 - This phase adds the UI layer on top of existing backend
-- ⚠️ Big Bang: may need integration fixes in Phase 5
+- ⚠️ Big Bang: may need integration fixes in Phase 6
 
 ## Review Checklist
-- [ ] All tasks completed
-- [ ] Code follows project conventions
+- [x] All tasks completed
+- [x] 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. -->
+- Created `BoardAccessControl.svelte` — self-contained board permission manager with search/autocomplete, fetches from `/api/boards/[id]/permissions`
+- Created `BoardShareDialog.svelte` — modal dialog for quick sharing with copy link, guest toggle, and permission management
+- Created `/api/boards/[id]/permissions` API endpoint with GET/POST/DELETE for board-scoped permissions
+- Enhanced `PermissionEditor.svelte` with search/autocomplete inputs replacing plain dropdowns
+- Updated `BoardCard.svelte` with globe (guest), lock (private), and users (shared) icons
+- Updated board editor with dedicated Guest Access and Permissions sections
+- Updated `BoardHeader.svelte` with Share button that opens the share dialog
+- Updated board view page (`[boardId]/+page.svelte`) and its server load to support share dialog with user/group data
+- Updated boards list server to compute `hasSharedPermissions` flag per board
+- Added ~20 new i18n keys in both `en.json` and `ru.json` for all new UI strings
+- Big Bang strategy: no build/test verification — Phase 6 integration may be needed