Fix build errors and TypeScript issues

- Install missing UI component dependencies
- Fix unused imports in React components
- Remove version numbers from all import statements
- Fix TypeScript errors in calendar and chart components
- Build now succeeds with production bundle generated

components/SprintManagement.tsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 import { useApp } from '../contexts/AppContext';
-import { Sprint, UserStory } from '../types';
+import { Sprint } from '../types';
 import { Card } from './ui/card';
 import { Badge } from './ui/badge';
 import { Button } from './ui/button';
@@ -12,7 +12,7 @@ import { format } from 'date-fns';
 import { Calendar, Plus, Edit, XCircle, PlayCircle } from 'lucide-react';
 
 export const SprintManagement: React.FC = () => {
-  const { sprints, userStories, updateSprint, closeSprint, addSprint, setActiveSprint, updateUserStory } = useApp();
+  const { sprints, userStories, updateSprint, closeSprint, addSprint, setActiveSprint } = useApp();
   const [editDialogOpen, setEditDialogOpen] = useState(false);
   const [createDialogOpen, setCreateDialogOpen] = useState(false);
   const [selectedSprint, setSelectedSprint] = useState<Sprint | null>(null);