feat: improve ICS calendar sync UX and fix room URL matching

- Replace "Test Connection" button with "Force Sync" button (Edit Room only)
- Show detailed sync results: total events downloaded vs room matches
- Remove emoticons and auto-hide timeout for cleaner UX
- Fix room URL matching to use UI_BASE_URL instead of BASE_URL
- Replace FaSync icon with LuRefreshCw for consistency
- Clear sync results when dialog closes or Force Sync pressed
- Update tests to reflect UI_BASE_URL change and exact URL matching

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

server/tests/test_ics_background_tasks.py

@@ -36,7 +36,7 @@ async def test_sync_room_ics_task():
     event.add("summary", "Task Test Meeting")
     from reflector.settings import settings
 
-    event.add("location", f"{settings.BASE_URL}/room/{room.name}")
+    event.add("location", f"{settings.UI_BASE_URL}/{room.name}")
     now = datetime.now(timezone.utc)
     event.add("dtstart", now + timedelta(hours=1))
     event.add("dtend", now + timedelta(hours=2))