⚡️(frontend) import LiveKit styles only in the room route

LiveKit styles are not needed across the whole app, only in the room
route. Import them locally there to avoid loading them globally.

src/frontend/src/App.tsx

@@ -1,4 +1,3 @@
-import '@livekit/components-styles'
 import '@/styles/index.css'
 import { Suspense } from 'react'
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools'

src/frontend/src/features/rooms/routes/Room.tsx

@@ -1,3 +1,4 @@
+import '@livekit/components-styles'
 import { ReactNode, useEffect, useState } from 'react'
 import { useLocation, useParams } from 'wouter'
 import { ErrorScreen } from '@/components/ErrorScreen'