Fix TypeScript compilation: remove deprecated baseUrl, add missing imports, fix type narrowing

- Remove deprecated baseUrl from tsconfig.app.json (TS 6.0 error)
- Add missing AlertCircle and Button imports in Dashboard.tsx
- Cast Sidebar onNavigate arg to fix View type mismatch

tsc exits 0, vite build exits 0

src/App.tsx

@@ -151,7 +151,7 @@ function AppContent() {
       <Sidebar
         onAddConnection={() => setConnectionDialogOpen(true)}
         activeView={view.type}
-        onNavigate={handleNavigate}
+        onNavigate={(v) => handleNavigate(v as View)}
       />
       <main className="flex-1 overflow-hidden">
         {renderMainContent()}

src/components/layout/Dashboard.tsx

@@ -2,12 +2,13 @@ import { useCallback } from 'react'
 import { useQueryClient } from '@tanstack/react-query'
 import { useNodes, useVMs, useTasks, queryKeys } from '@/hooks/useProxmox'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
-import { Server, Cpu, HardDrive, MemoryStick } from 'lucide-react'
+import { Server, Cpu, HardDrive, MemoryStick, AlertCircle } from 'lucide-react'
 import { ResourceGauge } from '@/components/dashboard/ResourceGauge'
 import { NodeHealthGrid } from '@/components/dashboard/NodeHealthGrid'
 import { ActivityFeed } from '@/components/dashboard/ActivityFeed'
 import { QuickActions } from '@/components/dashboard/QuickActions'
 import { formatBytes } from '@/lib/format'
+import { Button } from '@/components/ui/button'
 
 interface DashboardProps {
   connectionId: string

tsconfig.app.json

@@ -17,7 +17,6 @@
     "jsx": "react-jsx",
 
     /* Path aliases */
-    "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     },