fix: address second round of PR review feedback

- Add fallback for unknown enhancement modes in history button to prevent "Enhanced (undefined)" UI bug
- Move DescriptionHistoryEntry interface to top level in add-feature-dialog
- Import and use EnhancementMode type in edit-feature-dialog to eliminate hardcoded types
- Make FollowUpHistoryEntry extend BaseHistoryEntry for consistency

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

apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx

@@ -91,6 +91,13 @@ interface AddFeatureDialogProps {
   allFeatures?: Feature[];
 }
 
+/**
+ * A single entry in the description history
+ */
+interface DescriptionHistoryEntry extends BaseHistoryEntry {
+  description: string;
+}
+
 export function AddFeatureDialog({
   open,
   onOpenChange,
@@ -135,9 +142,6 @@ export function AddFeatureDialog({
   const [descriptionError, setDescriptionError] = useState(false);
 
   // Description history state
-  interface DescriptionHistoryEntry extends BaseHistoryEntry {
-    description: string;
-  }
   const [descriptionHistory, setDescriptionHistory] = useState<DescriptionHistoryEntry[]>([]);
 
   // Spawn mode state

apps/ui/src/components/views/board-view/dialogs/edit-feature-dialog.tsx

@@ -33,6 +33,7 @@ import {
   PlanningModeSelect,
   EnhanceWithAI,
   EnhancementHistoryButton,
+  type EnhancementMode,
 } from '../shared';
 import type { WorkMode } from '../shared';
 import { PhaseModelSelector } from '@/components/views/settings-view/model-defaults/phase-model-selector';
@@ -63,7 +64,7 @@ interface EditFeatureDialogProps {
       requirePlanApproval: boolean;
     },
     descriptionHistorySource?: 'enhance' | 'edit',
-    enhancementMode?: 'improve' | 'technical' | 'simplify' | 'acceptance' | 'ux-reviewer'
+    enhancementMode?: EnhancementMode
   ) => void;
   categorySuggestions: string[];
   branchSuggestions: string[];
@@ -112,7 +113,7 @@ export function EditFeatureDialog({
 
   // Track the source of description changes for history
   const [descriptionChangeSource, setDescriptionChangeSource] = useState<
-    { source: 'enhance'; mode: 'improve' | 'technical' | 'simplify' | 'acceptance' } | 'edit' | null
+    { source: 'enhance'; mode: EnhancementMode } | 'edit' | null
   >(null);
   // Track the original description when the dialog opened for comparison
   const [originalDescription, setOriginalDescription] = useState(feature?.description ?? '');

apps/ui/src/components/views/board-view/dialogs/follow-up-dialog.tsx

@@ -18,18 +18,20 @@ 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';
+import {
+  EnhanceWithAI,
+  EnhancementHistoryButton,
+  type EnhancementMode,
+  type BaseHistoryEntry,
+} from '../shared';
 
 const logger = createLogger('FollowUpDialog');
 
 /**
  * A single entry in the follow-up prompt history
  */
-export interface FollowUpHistoryEntry {
+export interface FollowUpHistoryEntry extends BaseHistoryEntry {
   prompt: string;
-  timestamp: string; // ISO date string
-  source: 'initial' | 'enhance' | 'edit';
-  enhancementMode?: EnhancementMode;
 }
 
 interface FollowUpDialogProps {

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

@@ -54,7 +54,9 @@ export function EnhancementHistoryButton<T extends BaseHistoryEntry>({
       return 'Original';
     }
     if (entry.source === 'enhance') {
-      return `Enhanced (${ENHANCEMENT_MODE_LABELS[entry.enhancementMode ?? 'improve']})`;
+      const mode = entry.enhancementMode ?? 'improve';
+      const label = ENHANCEMENT_MODE_LABELS[mode as EnhancementMode] ?? mode;
+      return `Enhanced (${label})`;
     }
     return 'Edited';
   };