refactor: extract Enhance with AI into shared components

Extract all "Enhance with AI" functionality into reusable shared components
following DRY principles and clean code guidelines.

Changes:
- Create shared/enhancement/ folder for related functionality
- Extract EnhanceWithAI component (AI enhancement with model override)
- Extract EnhancementHistoryButton component (version history UI)
- Extract enhancement constants and types
- Refactor add-feature-dialog.tsx to use shared components
- Refactor edit-feature-dialog.tsx to use shared components
- Refactor follow-up-dialog.tsx to use shared components
- Add history tracking to add-feature-dialog for consistency

Benefits:
- Eliminated ~527 lines of duplicated code
- Single source of truth for enhancement logic
- Consistent UX across all dialogs
- Easier maintenance and extensibility
- Better code organization

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

apps/ui/src/components/views/board-view/hooks/use-follow-up-state.ts

@@ -4,13 +4,18 @@ import {
   FeatureImagePath as DescriptionImagePath,
   ImagePreviewMap,
 } from '@/components/ui/description-image-dropzone';
+import type { FollowUpHistoryEntry } from '../dialogs/follow-up-dialog';
 
+/**
+ * Custom hook for managing follow-up dialog state including prompt history
+ */
 export function useFollowUpState() {
   const [showFollowUpDialog, setShowFollowUpDialog] = useState(false);
   const [followUpFeature, setFollowUpFeature] = useState<Feature | null>(null);
   const [followUpPrompt, setFollowUpPrompt] = useState('');
   const [followUpImagePaths, setFollowUpImagePaths] = useState<DescriptionImagePath[]>([]);
   const [followUpPreviewMap, setFollowUpPreviewMap] = useState<ImagePreviewMap>(() => new Map());
+  const [followUpPromptHistory, setFollowUpPromptHistory] = useState<FollowUpHistoryEntry[]>([]);
 
   const resetFollowUpState = useCallback(() => {
     setShowFollowUpDialog(false);
@@ -18,6 +23,7 @@ export function useFollowUpState() {
     setFollowUpPrompt('');
     setFollowUpImagePaths([]);
     setFollowUpPreviewMap(new Map());
+    setFollowUpPromptHistory([]);
   }, []);
 
   const handleFollowUpDialogChange = useCallback(
@@ -31,6 +37,13 @@ export function useFollowUpState() {
     [resetFollowUpState]
   );
 
+  /**
+   * Adds a new entry to the prompt history
+   */
+  const addToPromptHistory = useCallback((entry: FollowUpHistoryEntry) => {
+    setFollowUpPromptHistory((prev) => [...prev, entry]);
+  }, []);
+
   return {
     // State
     showFollowUpDialog,
@@ -38,14 +51,17 @@ export function useFollowUpState() {
     followUpPrompt,
     followUpImagePaths,
     followUpPreviewMap,
+    followUpPromptHistory,
     // Setters
     setShowFollowUpDialog,
     setFollowUpFeature,
     setFollowUpPrompt,
     setFollowUpImagePaths,
     setFollowUpPreviewMap,
+    setFollowUpPromptHistory,
     // Helpers
     resetFollowUpState,
     handleFollowUpDialogChange,
+    addToPromptHistory,
   };
 }