#98 UI: Activity Timeline Component

Create activity timeline component for user details and dashboard. Component: api/ui/templates/components/activity_timeline/ Files: - activity_timeline.html - activity_timeline.css - activity_timeline.js Features: - Vertical timeline layout - Entry components: - Timestamp (relative with tooltip for exact) - User avatar (if applicable) - Action icon by type - Action description - Resource link - Expandable details (JSON diff, etc.) - Styling: - Connecting line between entries - Action type color coding - Success/failure indication - Compact and expanded modes - Loading: - Skeleton loading state - Load more button at bottom - Infinite scroll option - Filtering: - Filter by action type (inline) - Date range filter Action Types with Icons: - CREATE (plus icon, green) - UPDATE (edit icon, blue) - DELETE (trash icon, red) - LOGIN (key icon) - LOGOUT (door icon) - ASSIGN (user-plus icon) - REVOKE (user-minus icon) With ultra attention to details and correctness. Before closing: write comment summarizing implementation with screenshot.