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>

app/(dashboard)/projects/[id]/kanban/page.tsx

@@ -20,6 +20,7 @@ import { KanbanColumn } from '@/components/features/kanban/KanbanColumn';
 import { StoryCard } from '@/components/features/kanban/StoryCard';
 import { CreateStoryDialog } from '@/components/features/stories/CreateStoryDialog';
 import type { Story, WorkItemStatus } from '@/types/project';
+import { logger } from '@/lib/utils/logger';
 
 const COLUMNS = [
   { id: 'Backlog', title: 'Backlog', color: 'bg-gray-100' },
@@ -50,15 +51,15 @@ export default function KanbanPage() {
     {
       // Story events (3 events)
       'StoryCreated': (event: any) => {
-        console.log('[Kanban] Story created:', event);
+        logger.debug('[Kanban] Story created:', event);
         queryClient.invalidateQueries({ queryKey: ['project-stories', projectId] });
       },
       'StoryUpdated': (event: any) => {
-        console.log('[Kanban] Story updated:', event);
+        logger.debug('[Kanban] Story updated:', event);
         queryClient.invalidateQueries({ queryKey: ['project-stories', projectId] });
       },
       'StoryDeleted': (event: any) => {
-        console.log('[Kanban] Story deleted:', event);
+        logger.debug('[Kanban] Story deleted:', event);
         queryClient.invalidateQueries({ queryKey: ['project-stories', projectId] });
       },
     },
@@ -97,7 +98,7 @@ export default function KanbanPage() {
     const story = stories.find((s) => s.id === active.id);
 
     if (story && story.status !== newStatus) {
-      console.log(`[Kanban] Changing story ${story.id} status to ${newStatus}`);
+      logger.debug(`[Kanban] Changing story ${story.id} status to ${newStatus}`);
       changeStatusMutation.mutate({ id: story.id, status: newStatus });
     }
   };