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/dialogs/follow-up-dialog.tsx

@@ -1,4 +1,5 @@
 import { useState } from 'react';
+import { createLogger } from '@automaker/utils/logger';
 import {
   Dialog,
   DialogContent,
@@ -17,6 +18,19 @@ import {
 } from '@/components/ui/description-image-dropzone';
 import { MessageSquare } from 'lucide-react';
 import { Feature } from '@/store/app-store';
+import { EnhanceWithAI, EnhancementHistoryButton, type EnhancementMode } from '../shared';
+
+const logger = createLogger('FollowUpDialog');
+
+/**
+ * A single entry in the follow-up prompt history
+ */
+export interface FollowUpHistoryEntry {
+  prompt: string;
+  timestamp: string; // ISO date string
+  source: 'initial' | 'enhance' | 'edit';
+  enhancementMode?: EnhancementMode;
+}
 
 interface FollowUpDialogProps {
   open: boolean;
@@ -30,6 +44,10 @@ interface FollowUpDialogProps {
   onPreviewMapChange: (map: ImagePreviewMap) => void;
   onSend: () => void;
   isMaximized: boolean;
+  /** History of prompt versions for restoration */
+  promptHistory?: FollowUpHistoryEntry[];
+  /** Callback to add a new entry to prompt history */
+  onHistoryAdd?: (entry: FollowUpHistoryEntry) => void;
 }
 
 export function FollowUpDialog({
@@ -44,9 +62,11 @@ export function FollowUpDialog({
   onPreviewMapChange,
   onSend,
   isMaximized,
+  promptHistory = [],
+  onHistoryAdd,
 }: FollowUpDialogProps) {
-  const handleClose = (open: boolean) => {
-    if (!open) {
+  const handleClose = (openState: boolean) => {
+    if (!openState) {
       onOpenChange(false);
     }
   };
@@ -77,7 +97,18 @@ export function FollowUpDialog({
         </DialogHeader>
         <div className="space-y-4 py-4 overflow-y-auto flex-1 min-h-0">
           <div className="space-y-2">
-            <Label htmlFor="follow-up-prompt">Instructions</Label>
+            <div className="flex items-center justify-between">
+              <Label htmlFor="follow-up-prompt">Instructions</Label>
+              {/* Version History Button */}
+              <EnhancementHistoryButton
+                history={promptHistory}
+                currentValue={prompt}
+                onRestore={onPromptChange}
+                valueAccessor={(entry) => entry.prompt}
+                title="Prompt History"
+                restoreMessage="Prompt restored from history"
+              />
+            </div>
             <DescriptionImageDropZone
               value={prompt}
               onChange={onPromptChange}
@@ -88,6 +119,21 @@ export function FollowUpDialog({
               onPreviewMapChange={onPreviewMapChange}
             />
           </div>
+
+          {/* Enhancement Section */}
+          <EnhanceWithAI
+            value={prompt}
+            onChange={onPromptChange}
+            onHistoryAdd={({ mode, enhancedText }) => {
+              onHistoryAdd?.({
+                prompt: enhancedText,
+                timestamp: new Date().toISOString(),
+                source: 'enhance',
+                enhancementMode: mode,
+              });
+            }}
+          />
+
           <p className="text-xs text-muted-foreground">
             The agent will continue from where it left off, using the existing context. You can
             attach screenshots to help explain the issue.