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/shared/enhancement/enhance-with-ai.tsx

@@ -0,0 +1,154 @@
+import { useState } from 'react';
+import { createLogger } from '@automaker/utils/logger';
+import { Button } from '@/components/ui/button';
+import { Collapsible, CollapsibleContent, CollapsibleTrigger } from '@/components/ui/collapsible';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
+import { Sparkles, ChevronDown, ChevronRight } from 'lucide-react';
+import { toast } from 'sonner';
+import { getElectronAPI } from '@/lib/electron';
+import { ModelOverrideTrigger, useModelOverride } from '@/components/shared';
+import { EnhancementMode, ENHANCEMENT_MODE_LABELS } from './enhancement-constants';
+
+const logger = createLogger('EnhanceWithAI');
+
+interface EnhanceWithAIProps {
+  /** Current text value to enhance */
+  value: string;
+  /** Callback when text is enhanced */
+  onChange: (enhancedText: string) => void;
+  /** Optional callback to track enhancement in history */
+  onHistoryAdd?: (entry: { mode: EnhancementMode; enhancedText: string }) => void;
+  /** Disable the enhancement feature */
+  disabled?: boolean;
+  /** Additional CSS classes */
+  className?: string;
+}
+
+/**
+ * Reusable "Enhance with AI" component
+ *
+ * Provides AI-powered text enhancement with multiple modes:
+ * - Improve Clarity
+ * - Add Technical Details
+ * - Simplify
+ * - Add Acceptance Criteria
+ * - User Experience
+ *
+ * Used in Add Feature, Edit Feature, and Follow-Up dialogs.
+ */
+export function EnhanceWithAI({
+  value,
+  onChange,
+  onHistoryAdd,
+  disabled = false,
+  className,
+}: EnhanceWithAIProps) {
+  const [isEnhancing, setIsEnhancing] = useState(false);
+  const [enhancementMode, setEnhancementMode] = useState<EnhancementMode>('improve');
+  const [enhanceOpen, setEnhanceOpen] = useState(false);
+
+  // Enhancement model override
+  const enhancementOverride = useModelOverride({ phase: 'enhancementModel' });
+
+  const handleEnhance = async () => {
+    if (!value.trim() || isEnhancing || disabled) return;
+
+    setIsEnhancing(true);
+    try {
+      const api = getElectronAPI();
+      const result = await api.enhancePrompt?.enhance(
+        value,
+        enhancementMode,
+        enhancementOverride.effectiveModel
+      );
+
+      if (result?.success && result.enhancedText) {
+        const enhancedText = result.enhancedText;
+        onChange(enhancedText);
+
+        // Track in history if callback provided
+        onHistoryAdd?.({ mode: enhancementMode, enhancedText });
+
+        toast.success('Enhanced successfully!');
+      } else {
+        toast.error(result?.error || 'Failed to enhance');
+      }
+    } catch (error) {
+      logger.error('Enhancement failed:', error);
+      toast.error('Failed to enhance');
+    } finally {
+      setIsEnhancing(false);
+    }
+  };
+
+  return (
+    <Collapsible open={enhanceOpen} onOpenChange={setEnhanceOpen} className={className}>
+      <CollapsibleTrigger asChild>
+        <button
+          className="flex items-center gap-2 text-sm text-muted-foreground hover:text-foreground transition-colors w-full py-1"
+          disabled={disabled}
+        >
+          {enhanceOpen ? <ChevronDown className="w-4 h-4" /> : <ChevronRight className="w-4 h-4" />}
+          <Sparkles className="w-4 h-4" />
+          <span>Enhance with AI</span>
+        </button>
+      </CollapsibleTrigger>
+      <CollapsibleContent className="pt-3">
+        <div className="flex flex-wrap items-center gap-2 pl-6">
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button variant="outline" size="sm" className="h-8 text-xs" disabled={disabled}>
+                {ENHANCEMENT_MODE_LABELS[enhancementMode]}
+                <ChevronDown className="w-3 h-3 ml-1" />
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="start">
+              <DropdownMenuItem onClick={() => setEnhancementMode('improve')}>
+                {ENHANCEMENT_MODE_LABELS.improve}
+              </DropdownMenuItem>
+              <DropdownMenuItem onClick={() => setEnhancementMode('technical')}>
+                {ENHANCEMENT_MODE_LABELS.technical}
+              </DropdownMenuItem>
+              <DropdownMenuItem onClick={() => setEnhancementMode('simplify')}>
+                {ENHANCEMENT_MODE_LABELS.simplify}
+              </DropdownMenuItem>
+              <DropdownMenuItem onClick={() => setEnhancementMode('acceptance')}>
+                {ENHANCEMENT_MODE_LABELS.acceptance}
+              </DropdownMenuItem>
+              <DropdownMenuItem onClick={() => setEnhancementMode('ux-reviewer')}>
+                {ENHANCEMENT_MODE_LABELS['ux-reviewer']}
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
+
+          <Button
+            type="button"
+            variant="default"
+            size="sm"
+            className="h-8 text-xs"
+            onClick={handleEnhance}
+            disabled={!value.trim() || isEnhancing || disabled}
+            loading={isEnhancing}
+          >
+            <Sparkles className="w-3 h-3 mr-1" />
+            Enhance
+          </Button>
+
+          <ModelOverrideTrigger
+            currentModelEntry={enhancementOverride.effectiveModelEntry}
+            onModelChange={enhancementOverride.setOverride}
+            phase="enhancementModel"
+            isOverridden={enhancementOverride.isOverridden}
+            size="sm"
+            variant="icon"
+          />
+        </div>
+      </CollapsibleContent>
+    </Collapsible>
+  );
+}

apps/ui/src/components/views/board-view/shared/enhancement/enhancement-constants.ts

@@ -0,0 +1,20 @@
+/** Enhancement mode options for AI-powered prompt improvement */
+export type EnhancementMode = 'improve' | 'technical' | 'simplify' | 'acceptance' | 'ux-reviewer';
+
+/** Labels for enhancement modes displayed in the UI */
+export const ENHANCEMENT_MODE_LABELS: Record<EnhancementMode, string> = {
+  improve: 'Improve Clarity',
+  technical: 'Add Technical Details',
+  simplify: 'Simplify',
+  acceptance: 'Add Acceptance Criteria',
+  'ux-reviewer': 'User Experience',
+};
+
+/** Descriptions for enhancement modes (for tooltips/accessibility) */
+export const ENHANCEMENT_MODE_DESCRIPTIONS: Record<EnhancementMode, string> = {
+  improve: 'Make the prompt clearer and more concise',
+  technical: 'Add implementation details and specifications',
+  simplify: 'Reduce complexity while keeping the core intent',
+  acceptance: 'Add specific acceptance criteria and test cases',
+  'ux-reviewer': 'Add user experience considerations and flows',
+};

apps/ui/src/components/views/board-view/shared/enhancement/enhancement-history-button.tsx

@@ -0,0 +1,129 @@
+import { useState } from 'react';
+import { Button } from '@/components/ui/button';
+import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
+import { History } from 'lucide-react';
+import { toast } from 'sonner';
+import { EnhancementMode, ENHANCEMENT_MODE_LABELS } from './enhancement-constants';
+
+/**
+ * Base interface for history entries
+ */
+export interface BaseHistoryEntry {
+  timestamp: string;
+  source: 'initial' | 'enhance' | 'edit';
+  enhancementMode?: EnhancementMode;
+}
+
+interface EnhancementHistoryButtonProps<T extends BaseHistoryEntry> {
+  /** Array of history entries */
+  history: T[];
+  /** Current value to compare against for highlighting */
+  currentValue: string;
+  /** Callback when a history entry is restored */
+  onRestore: (value: string) => void;
+  /** Function to extract the text value from a history entry */
+  valueAccessor: (entry: T) => string;
+  /** Title for the history popover (e.g., "Version History", "Prompt History") */
+  title?: string;
+  /** Message shown when restoring an entry */
+  restoreMessage?: string;
+}
+
+/**
+ * Reusable history button component for enhancement-related history
+ *
+ * Displays a popover with a list of historical versions that can be restored.
+ * Used in edit-feature-dialog and follow-up-dialog for description/prompt history.
+ */
+export function EnhancementHistoryButton<T extends BaseHistoryEntry>({
+  history,
+  currentValue,
+  onRestore,
+  valueAccessor,
+  title = 'Version History',
+  restoreMessage = 'Restored from history',
+}: EnhancementHistoryButtonProps<T>) {
+  const [showHistory, setShowHistory] = useState(false);
+
+  if (history.length === 0) {
+    return null;
+  }
+
+  const getSourceLabel = (entry: T): string => {
+    if (entry.source === 'initial') {
+      return 'Original';
+    }
+    if (entry.source === 'enhance') {
+      return `Enhanced (${ENHANCEMENT_MODE_LABELS[entry.enhancementMode ?? 'improve']})`;
+    }
+    return 'Edited';
+  };
+
+  const formatDate = (timestamp: string): string => {
+    const date = new Date(timestamp);
+    return date.toLocaleDateString(undefined, {
+      month: 'short',
+      day: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  };
+
+  return (
+    <Popover open={showHistory} onOpenChange={setShowHistory}>
+      <PopoverTrigger asChild>
+        <Button
+          type="button"
+          variant="ghost"
+          size="sm"
+          className="h-7 gap-1.5 text-xs text-muted-foreground"
+        >
+          <History className="w-3.5 h-3.5" />
+          History ({history.length})
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent className="w-80 p-0" align="end">
+        <div className="p-3 border-b">
+          <h4 className="font-medium text-sm">{title}</h4>
+          <p className="text-xs text-muted-foreground mt-1">Click a version to restore it</p>
+        </div>
+        <div className="max-h-64 overflow-y-auto p-2 space-y-1">
+          {[...history].reverse().map((entry, index) => {
+            const value = valueAccessor(entry);
+            const isCurrentVersion = value === currentValue;
+            const sourceLabel = getSourceLabel(entry);
+            const formattedDate = formatDate(entry.timestamp);
+
+            return (
+              <button
+                key={`${entry.timestamp}-${index}`}
+                onClick={() => {
+                  onRestore(value);
+                  setShowHistory(false);
+                  toast.success(restoreMessage);
+                }}
+                className={`w-full text-left p-2 rounded-md hover:bg-muted transition-colors ${
+                  isCurrentVersion ? 'bg-muted/50 border border-primary/20' : ''
+                }`}
+              >
+                <div className="flex items-center justify-between gap-2">
+                  <span className="text-xs font-medium">{sourceLabel}</span>
+                  <span className="text-xs text-muted-foreground">{formattedDate}</span>
+                </div>
+                <p className="text-xs text-muted-foreground mt-1 line-clamp-2">
+                  {value.slice(0, 100)}
+                  {value.length > 100 ? '...' : ''}
+                </p>
+                {isCurrentVersion && (
+                  <span className="text-xs text-primary font-medium mt-1 block">
+                    Current version
+                  </span>
+                )}
+              </button>
+            );
+          })}
+        </div>
+      </PopoverContent>
+    </Popover>
+  );
+}

apps/ui/src/components/views/board-view/shared/enhancement/index.ts

@@ -0,0 +1,3 @@
+export * from './enhancement-constants';
+export * from './enhance-with-ai';
+export * from './enhancement-history-button';

apps/ui/src/components/views/board-view/shared/index.ts

@@ -10,3 +10,4 @@ export * from './planning-mode-selector';
 export * from './planning-mode-select';
 export * from './ancestor-context-section';
 export * from './work-mode-selector';
+export * from './enhancement';