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/components/views/settings-view/config/navigation.ts

@@ -7,6 +7,7 @@ import {
   Volume2,
   FlaskConical,
   Trash2,
+  Sparkles,
 } from "lucide-react";
 import type { SettingsViewId } from "../hooks/use-settings-view";
 
@@ -20,6 +21,7 @@ export interface NavigationItem {
 export const NAV_ITEMS: NavigationItem[] = [
   { id: "api-keys", label: "API Keys", icon: Key },
   { id: "claude", label: "Claude", icon: Terminal },
+  { id: "ai-enhancement", label: "AI Enhancement", icon: Sparkles },
   { id: "appearance", label: "Appearance", icon: Palette },
   { id: "keyboard", label: "Keyboard Shortcuts", icon: Settings2 },
   { id: "audio", label: "Audio", icon: Volume2 },