- Create ProviderIcon component with provider-to-icon mappings (OpenAI, Anthropic, Google, etc.)
- Build CustomModelDropdown with icon display, filtering, and keyboard navigation
- Integrate custom dropdown into ModelSelectorTab replacing native select element
- Add CSS styles for provider icons in dropdown items and model badges
- Add comprehensive tests for ProviderIcon, CustomModelDropdown, and ModelSelectorTab
- Create new combobox component for model/provider selection
- Refactor ModelSelectorTab to use combined dropdown UI
- Add scrollIntoView null check for test environment compatibility
- Add changeset for combined model dropdown feature
- Clean up obsolete changeset and subtask-related code
- Add search input with clear button and results count to ModelSelectorTab
- Extract filterModels utility for shared filtering logic across components
- Apply filtering to SettingsModal model section
- Add CSS styles for filter UI components
- Add comprehensive tests for ModelSelectorTab and SettingsModal filtering
- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior
