feat: add AI enhancement feature to settings and board views

- Introduced AIEnhancementSection to settings view for selecting enhancement models.
- Implemented enhancement functionality in AddFeatureDialog and EditFeatureDialog, allowing users to enhance feature descriptions with AI.
- Added dropdown menu for selecting enhancement modes (improve, technical, simplify, acceptance).
- Integrated new API endpoints for enhancing text using Claude AI.
- Updated navigation to include AI enhancement section in settings.

This enhances user experience by providing AI-powered text enhancement capabilities directly within the application.

apps/app/src/store/app-store.ts

@@ -409,6 +409,9 @@ export interface AppState {
   // Audio Settings
   muteDoneSound: boolean; // When true, mute the notification sound when agents complete (default: false)
 
+  // Enhancement Model Settings
+  enhancementModel: AgentModel; // Model used for feature enhancement (default: sonnet)
+
   // Project Analysis
   projectAnalysis: ProjectAnalysis | null;
   isAnalyzing: boolean;
@@ -577,6 +580,9 @@ export interface AppActions {
   // Audio Settings actions
   setMuteDoneSound: (muted: boolean) => void;
 
+  // Enhancement Model actions
+  setEnhancementModel: (model: AgentModel) => void;
+
   // AI Profile actions
   addAIProfile: (profile: Omit<AIProfile, "id">) => void;
   updateAIProfile: (id: string, updates: Partial<AIProfile>) => void;
@@ -714,6 +720,7 @@ const initialState: AppState = {
   showProfilesOnly: false, // Default to showing all options (not profiles only)
   keyboardShortcuts: DEFAULT_KEYBOARD_SHORTCUTS, // Default keyboard shortcuts
   muteDoneSound: false, // Default to sound enabled (not muted)
+  enhancementModel: "sonnet", // Default to sonnet for feature enhancement
   aiProfiles: DEFAULT_AI_PROFILES,
   projectAnalysis: null,
   isAnalyzing: false,
@@ -1331,6 +1338,9 @@ export const useAppStore = create<AppState & AppActions>()(
       // Audio Settings actions
       setMuteDoneSound: (muted) => set({ muteDoneSound: muted }),
 
+      // Enhancement Model actions
+      setEnhancementModel: (model) => set({ enhancementModel: model }),
+
       // AI Profile actions
       addAIProfile: (profile) => {
         const id = `profile-${Date.now()}-${Math.random()
@@ -2162,6 +2172,7 @@ export const useAppStore = create<AppState & AppActions>()(
         showProfilesOnly: state.showProfilesOnly,
         keyboardShortcuts: state.keyboardShortcuts,
         muteDoneSound: state.muteDoneSound,
+        enhancementModel: state.enhancementModel,
         // Profiles and sessions
         aiProfiles: state.aiProfiles,
         chatSessions: state.chatSessions,