feat: complete Scrum-manager MVP — dark-themed multi-user task manager

- Login with role-based auth (CTO/Manager/Employee)
- Calendar view (month/week) with task chips and quick-add
- Kanban board with status columns
- Sortable list view with action menus
- Task detail drawer with subtasks, comments, activity
- Add task modal with validation
- Dashboard with stats, workload, priority breakdown
- Team tasks grouped by assignee
- Reports page with recharts (bar, pie, line, horizontal bar)
- Members page with invite modal
- Search and assignee filter across views
- ErrorBoundary for production error handling
- Full dark design system via index.css

vite.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})