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/components/SyncStatusIndicator.tsx

@@ -0,0 +1,52 @@
+'use client';
+
+/**
+ * SyncStatusIndicator Component
+ *
+ * Displays sync status with external issue trackers.
+ *
+ * @module features/issues/components/SyncStatusIndicator
+ */
+
+import { CheckCircle2, RefreshCw, AlertCircle, AlertTriangle } from 'lucide-react';
+import { cn } from '@/lib/utils';
+import type { SyncStatus } from '../types';
+import { SYNC_STATUS_CONFIG } from '../constants';
+
+const SYNC_ICONS = {
+  synced: CheckCircle2,
+  pending: RefreshCw,
+  conflict: AlertTriangle,
+  error: AlertCircle,
+} as const;
+
+interface SyncStatusIndicatorProps {
+  status: SyncStatus;
+  className?: string;
+  showLabel?: boolean;
+}
+
+export function SyncStatusIndicator({
+  status,
+  className,
+  showLabel = false,
+}: SyncStatusIndicatorProps) {
+  const config = SYNC_STATUS_CONFIG[status] || SYNC_STATUS_CONFIG.synced;
+  const Icon = SYNC_ICONS[status] || CheckCircle2;
+  const isPending = status === 'pending';
+
+  return (
+    <div
+      className={cn('flex items-center gap-1', className)}
+      title={config.label}
+      role="status"
+      aria-label={`Sync status: ${config.label}`}
+    >
+      <Icon
+        className={cn('h-3.5 w-3.5', config.color, isPending && 'animate-spin')}
+        aria-hidden="true"
+      />
+      {showLabel && <span className={cn('text-xs', config.color)}>{config.label}</span>}
+    </div>
+  );
+}