Fix memory leak in AppInitialization and remove unused import

- Add cleanup function for CSS link element to prevent memory leak
- Remove unused log import from VideoConference component

Author: UGilfoyle

src/frontend/src/components/AppInitialization.tsx

@@ -20,12 +20,19 @@ export const AppInitialization = () => {
   useSupport(support)
 
   useEffect(() => {
-    if (custom_css_url) {
-      const link = document.createElement('link')
-      link.href = custom_css_url
-      link.id = 'meet-custom-css'
-      link.rel = 'stylesheet'
-      document.head.appendChild(link)
+    if (!custom_css_url) return
+
+    const link = document.createElement('link')
+    link.href = custom_css_url
+    link.id = 'meet-custom-css'
+    link.rel = 'stylesheet'
+    document.head.appendChild(link)
+
+    return () => {
+      const existingLink = document.getElementById('meet-custom-css')
+      if (existingLink) {
+        existingLink.remove()
+      }
     }
   }, [custom_css_url])
 

src/frontend/src/features/rooms/livekit/prefabs/VideoConference.tsx

@@ -3,7 +3,6 @@ import {
   isEqualTrackRef,
   isTrackReference,
   isWeb,
-  log,
 } from '@livekit/components-core'
 import { RoomEvent, Track } from 'livekit-client'
 import * as React from 'react'