feat(ui): Add Phase Models settings tab

- Add PhaseModelsSection with grouped phase configuration:
  - Quick Tasks: enhancement, file/image description
  - Validation Tasks: GitHub issue validation
  - Generation Tasks: spec, features, backlog, analysis
- Add PhaseModelSelector component showing Claude + Cursor models
- Add phaseModels state and actions to app-store
- Add 'phase-models' navigation item with Workflow icon

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

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

apps/ui/src/components/views/settings-view/hooks/use-settings-view.ts

@@ -5,6 +5,7 @@ export type SettingsViewId =
   | 'claude'
   | 'providers'
   | 'ai-enhancement'
+  | 'phase-models'
   | 'appearance'
   | 'terminal'
   | 'keyboard'