refactor(frontend): Replace console.log with logger utility - Sprint 3 Story 1

Replace all console.log/warn/error statements with unified logger utility.

Changes:
- Replaced console in lib/hooks/use-stories.ts
- Replaced console in lib/signalr/SignalRContext.tsx
- Replaced console in lib/hooks/useProjectHub.ts
- Replaced console in lib/hooks/use-tasks.ts
- Replaced console in lib/hooks/useNotificationHub.ts
- Replaced console in lib/hooks/use-projects.ts
- Replaced console in app/(dashboard)/projects/[id]/kanban/page.tsx

Logger respects NODE_ENV (debug disabled in production).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/signalr/SignalRContext.tsx

@@ -6,6 +6,7 @@ import { SignalRConnectionManager, ConnectionState } from './ConnectionManager';
 import { SIGNALR_CONFIG } from './config';
 import { useAuthStore } from '@/stores/authStore';
 import { toast } from 'sonner';
+import { logger } from '@/lib/utils/logger';
 
 // ============================================
 // TYPE DEFINITIONS
@@ -110,12 +111,12 @@ export function SignalRProvider({
 
   const connect = useCallback(async () => {
     if (!isAuthenticated) {
-      console.warn('[SignalRContext] Cannot connect: user not authenticated');
+      logger.warn('[SignalRContext] Cannot connect: user not authenticated');
       return;
     }
 
     if (managerRef.current?.state === 'connected') {
-      console.log('[SignalRContext] Already connected');
+      logger.debug('[SignalRContext] Already connected');
       return;
     }
 
@@ -148,7 +149,7 @@ export function SignalRProvider({
     try {
       await manager.start();
     } catch (error) {
-      console.error('[SignalRContext] Connection error:', error);
+      logger.error('[SignalRContext] Connection error:', error);
       if (showToasts) {
         toast.error('Failed to connect to real-time updates');
       }