feat(frontend): implement main dashboard page (#48)

Implement the main dashboard / projects list page for Syndarix as the landing
page after login. The implementation includes:

Dashboard Components:
- QuickStats: Overview cards showing active projects, agents, issues, approvals
- ProjectsSection: Grid/list view with filtering and sorting controls
- ProjectCardGrid: Rich project cards for grid view
- ProjectRowList: Compact rows for list view
- ActivityFeed: Real-time activity sidebar with connection status
- PerformanceCard: Performance metrics display
- EmptyState: Call-to-action for new users
- ProjectStatusBadge: Status indicator with icons
- ComplexityIndicator: Visual complexity dots
- ProgressBar: Accessible progress bar component

Features:
- Projects grid/list view with view mode toggle
- Filter by status (all, active, paused, completed, archived)
- Sort by recent, name, progress, or issues
- Quick stats overview with counts
- Real-time activity feed sidebar with live/reconnecting status
- Performance metrics card
- Create project button linking to wizard
- Responsive layout for mobile/desktop
- Loading skeleton states
- Empty state for new users

API Integration:
- useProjects hook for fetching projects (mock data until backend ready)
- useDashboardStats hook for statistics
- TanStack Query for caching and data fetching

Testing:
- 37 unit tests covering all dashboard components
- E2E test suite for dashboard functionality
- Accessibility tests (keyboard nav, aria attributes, heading hierarchy)

Technical:
- TypeScript strict mode compliance
- ESLint passing
- WCAG AA accessibility compliance
- Mobile-first responsive design
- Dark mode support via semantic tokens
- Follows design system guidelines

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/features/issues/index.ts

@@ -0,0 +1,70 @@
+/**
+ * Issue Management Feature
+ *
+ * Complete issue tracking and management for Syndarix projects.
+ *
+ * @module features/issues
+ */
+
+// Components
+export {
+  StatusBadge,
+  PriorityBadge,
+  SyncStatusIndicator,
+  IssueFilters,
+  IssueTable,
+  BulkActions,
+  StatusWorkflow,
+  ActivityTimeline,
+  IssueDetailPanel,
+} from './components';
+
+// Hooks
+export {
+  useIssues,
+  useIssue,
+  useUpdateIssue,
+  useUpdateIssueStatus,
+  useBulkIssueAction,
+  useSyncIssue,
+  issueKeys,
+} from './hooks';
+
+// Types - use explicit names to avoid collision with component IssueFilters
+export type {
+  IssueStatus,
+  IssuePriority,
+  SyncStatus,
+  ActorType,
+  IssueAssignee,
+  IssueLabel,
+  IssueActivity,
+  IssueSummary,
+  IssueDetail,
+  IssueFilters as IssueFiltersType,
+  IssueSortField,
+  IssueSortDirection,
+  IssueSort,
+  IssueBulkAction,
+  IssueBulkActionRequest,
+  IssueUpdateRequest,
+  IssueSyncRequest,
+  StatusTransition,
+  StatusConfig,
+  PriorityConfig,
+  PaginatedIssuesResponse,
+} from './types';
+
+// Constants
+export {
+  STATUS_CONFIG,
+  PRIORITY_CONFIG,
+  STATUS_TRANSITIONS,
+  getAvailableTransitions,
+  getPrimaryTransition,
+  STATUS_ORDER,
+  PRIORITY_ORDER,
+  SYNC_STATUS_CONFIG,
+  DEFAULT_PAGE_SIZE,
+  MAX_BULK_SELECTION,
+} from './constants';