feat: add pre-enhancement description tracking for feature updates

- Introduced a new parameter `preEnhancementDescription` to capture the original description before enhancements.
- Updated the `update` method in `FeatureLoader` to handle the new parameter and maintain a history of original descriptions.
- Enhanced UI components to support tracking and restoring pre-enhancement descriptions across various dialogs.
- Improved history management in `AddFeatureDialog`, `EditFeatureDialog`, and `FollowUpDialog` to include original text for better user experience.

This change enhances the ability to revert to previous descriptions, improving the overall functionality of the feature enhancement process.

apps/ui/src/lib/http-api-client.ts

@@ -1459,7 +1459,8 @@ export class HttpApiClient implements ElectronAPI {
       featureId: string,
       updates: Partial<Feature>,
       descriptionHistorySource?: 'enhance' | 'edit',
-      enhancementMode?: 'improve' | 'technical' | 'simplify' | 'acceptance' | 'ux-reviewer'
+      enhancementMode?: 'improve' | 'technical' | 'simplify' | 'acceptance' | 'ux-reviewer',
+      preEnhancementDescription?: string
     ) =>
       this.post('/api/features/update', {
         projectPath,
@@ -1467,6 +1468,7 @@ export class HttpApiClient implements ElectronAPI {
         updates,
         descriptionHistorySource,
         enhancementMode,
+        preEnhancementDescription,
       }),
     delete: (projectPath: string, featureId: string) =>
       this.post('/api/features/delete', { projectPath, featureId }),