Fix timelapse auto-download and browser tab crash on print completion

1. Timelapse auto-download rewrite (main.py)
   - New retry mechanism with short delays (5s, 10s, 20s)
   - Grabs most recent file directly without mtime comparison
   - Works with printers that have wrong clock (LAN-only mode)
   - Checks multiple paths: /timelapse, /timelapse/video, /record, /recording

2. Browser tab crash fix (PrintersPage.tsx)
   - Throttled query cache subscription using requestAnimationFrame
   - Prevents rapid re-render cascade on print completion events

3. WebSocket optimization (main.py)
   - Removed large raw_data field from print_complete message
   - Only sends necessary fields: status, filename, subtask_name, timelapse_was_active

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/pages/PrintersPage.tsx

@@ -453,10 +453,18 @@ function StatusSummaryBar({ printers }: { printers: Printer[] | undefined }) {
   }, [printers, queryClient]);
 
   // Subscribe to query cache changes to re-render when status updates
+  // Throttled to prevent rapid re-renders from causing tab crashes
   const [, setTick] = useState(0);
   useEffect(() => {
+    let pending = false;
     const unsubscribe = queryClient.getQueryCache().subscribe(() => {
-      setTick(t => t + 1);
+      if (!pending) {
+        pending = true;
+        requestAnimationFrame(() => {
+          setTick(t => t + 1);
+          pending = false;
+        });
+      }
     });
     return () => unsubscribe();
   }, [queryClient]);