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/lib/http-api-client.ts

@@ -58,6 +58,12 @@ type EventType =
 
 type EventCallback = (payload: unknown) => void;
 
+interface EnhancePromptResult {
+  success: boolean;
+  enhancedText?: string;
+  error?: string;
+}
+
 /**
  * HTTP API Client that implements ElectronAPI interface
  */
@@ -546,6 +552,20 @@ export class HttpApiClient implements ElectronAPI {
     },
   };
 
+  // Enhance Prompt API
+  enhancePrompt = {
+    enhance: (
+      originalText: string,
+      enhancementMode: string,
+      model?: string
+    ): Promise<EnhancePromptResult> =>
+      this.post("/api/enhance-prompt", {
+        originalText,
+        enhancementMode,
+        model,
+      }),
+  };
+
   // Worktree API
   worktree: WorktreeAPI = {
     revertFeature: (projectPath: string, featureId: string) =>