feat: Implement GitHub issue validation management and UI enhancements

- Introduced CRUD operations for GitHub issue validation results, including storage and retrieval.
- Added new endpoints for checking validation status, stopping validations, and deleting stored validations.
- Enhanced the GitHub routes to support validation management features.
- Updated the UI to display validation results and manage validation states for GitHub issues.
- Integrated event handling for validation progress and completion notifications.

apps/ui/src/store/app-store.ts

@@ -475,6 +475,9 @@ export interface AppState {
   // Enhancement Model Settings
   enhancementModel: AgentModel; // Model used for feature enhancement (default: sonnet)
 
+  // Validation Model Settings
+  validationModel: AgentModel; // Model used for GitHub issue validation (default: opus)
+
   // Project Analysis
   projectAnalysis: ProjectAnalysis | null;
   isAnalyzing: boolean;
@@ -745,6 +748,9 @@ export interface AppActions {
   // Enhancement Model actions
   setEnhancementModel: (model: AgentModel) => void;
 
+  // Validation Model actions
+  setValidationModel: (model: AgentModel) => void;
+
   // AI Profile actions
   addAIProfile: (profile: Omit<AIProfile, 'id'>) => void;
   updateAIProfile: (id: string, updates: Partial<AIProfile>) => void;
@@ -915,6 +921,7 @@ const initialState: AppState = {
   keyboardShortcuts: DEFAULT_KEYBOARD_SHORTCUTS, // Default keyboard shortcuts
   muteDoneSound: false, // Default to sound enabled (not muted)
   enhancementModel: 'sonnet', // Default to sonnet for feature enhancement
+  validationModel: 'opus', // Default to opus for GitHub issue validation
   aiProfiles: DEFAULT_AI_PROFILES,
   projectAnalysis: null,
   isAnalyzing: false,
@@ -1537,6 +1544,9 @@ export const useAppStore = create<AppState & AppActions>()(
       // Enhancement Model actions
       setEnhancementModel: (model) => set({ enhancementModel: model }),
 
+      // Validation Model actions
+      setValidationModel: (model) => set({ validationModel: model }),
+
       // AI Profile actions
       addAIProfile: (profile) => {
         const id = `profile-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
@@ -2679,6 +2689,7 @@ export const useAppStore = create<AppState & AppActions>()(
           keyboardShortcuts: state.keyboardShortcuts,
           muteDoneSound: state.muteDoneSound,
           enhancementModel: state.enhancementModel,
+          validationModel: state.validationModel,
           // Profiles and sessions
           aiProfiles: state.aiProfiles,
           chatSessions: state.chatSessions,