feat(settings): add search functionality to settings modal (P2)

Implement Phase 2 search bar feature for settings modal:

- Add search input to settings modal header with icon and clear button
- Implement real-time filtering with 150ms debounce for performance
- Add visual highlighting for matched search terms using accent color
- Implement empty search results state with user-friendly message
- Add keyboard shortcuts (Escape to clear search)
- Auto-expand sections containing matching content during search
- Fix header layout to prevent overlap with close button
- Update progress tracker documenting P2 completion
- Add translation keys for search feature (placeholder, clear, no results)
- Sync translations across all language files

Files changed:
- templates/components/modals/settings_modal.html
- static/css/components/modal/settings-modal.css
- static/js/managers/SettingsManager.js
- locales/*.json (10 language files)
- docs/ui-ux-optimization/progress-tracker.md

docs/ui-ux-optimization/progress-tracker.md

@@ -3,7 +3,7 @@
 ## Project Overview
 **Goal**: Optimize Settings Modal UI/UX with left navigation sidebar
 **Started**: 2026-02-23
-**Current Phase**: P0 - Left Navigation Sidebar
+**Current Phase**: P2 - Search Bar (Completed)
 
 ---
 
@@ -74,25 +74,42 @@ None currently
 
 ## Phase 1: Section Collapse/Expand (P1)
 
-### Status: Planned
+### Status: Completed ✓
+
+### Completion Notes
+- All sections now have collapse/expand functionality
+- Chevron icon rotates smoothly on toggle
+- State persistence via localStorage working correctly
+- CSS animations for smooth height transitions
+- Settings order reorganized to match sidebar navigation
 
 ### Tasks
-- [ ] Add collapse/expand toggle to section headers
-- [ ] Add chevron icon with rotation animation
-- [ ] Implement localStorage for state persistence
-- [ ] Add CSS animations for smooth transitions
+- [x] Add collapse/expand toggle to section headers
+- [x] Add chevron icon with rotation animation
+- [x] Implement localStorage for state persistence
+- [x] Add CSS animations for smooth transitions
+- [x] Reorder settings sections to match sidebar navigation
 
 ---
 
 ## Phase 2: Search Bar (P1)
 
-### Status: Planned
+### Status: Completed ✓
+
+### Completion Notes
+- Search input added to settings modal header with icon and clear button
+- Real-time filtering with debounced input (150ms delay)
+- Highlight matching terms with accent color background
+- Handle empty search results with user-friendly message
+- Keyboard shortcuts: Escape to clear search
+- Sections with matches are automatically expanded
+- All translation keys added and synchronized across languages
 
 ### Tasks
-- [ ] Add search input to header area
-- [ ] Implement real-time filtering
-- [ ] Add highlight for matched terms
-- [ ] Handle empty search results
+- [x] Add search input to header area
+- [x] Implement real-time filtering
+- [x] Add highlight for matched terms
+- [x] Handle empty search results
 
 ---
 
@@ -121,7 +138,29 @@ None currently
 
 ## Change Log
 
-### 2026-02-23
+### 2026-02-23 (P2)
+- Completed Phase 2: Search Bar
+- Added search input to settings modal header with search icon and clear button
+- Implemented real-time filtering with 150ms debounce for performance
+- Added visual highlighting for matched search terms using accent color
+- Implemented empty search results state with user-friendly message
+- Added keyboard shortcuts (Escape to clear search)
+- Sections with matching content are automatically expanded during search
+- Updated SettingsManager.js with search initialization and filtering logic
+- Added comprehensive CSS styles for search input, highlights, and responsive design
+- Added translation keys for search feature (placeholder, clear, no results)
+- Synchronized translations across all language files
+
+### 2026-02-23 (P1)
+- Completed Phase 1: Section Collapse/Expand
+- Added collapse/expand functionality to all settings sections
+- Implemented chevron icon with smooth rotation animation
+- Added localStorage persistence for collapse state
+- Reorganized settings sections to match sidebar navigation order
+- Updated SettingsManager.js with section collapse initialization
+- Added CSS styles for smooth transitions and animations
+
+### 2026-02-23 (P0)
 - Created project documentation
 - Started Phase 0 implementation
 - Analyzed existing code structure