fix: add window resize fallback and delay refresh to next frame

- Add window resize listener as fallback for ResizeObserver
- Use 250ms debounce to avoid early layout reads
- Delay term.refresh() to next animation frame so renderer
  can process resize before we force redraw
- Clean up window resize listener on unmount

apps/web/src/components/terminal.tsx

@@ -229,7 +229,10 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
       fitAddonRef.current.fit();
       const { cols, rows } = termRef.current;
       if (cols !== oldCols || rows !== oldRows) {
-        termRef.current.refresh(0, rows - 1);
+        // Delay refresh to next frame so renderer can process resize first
+        requestAnimationFrame(() => {
+          termRef.current?.refresh(0, rows - 1);
+        });
       }
       if (ws.readyState === WebSocket.OPEN) {
         ws.send(JSON.stringify({ type: "resize", cols, rows }));
@@ -290,6 +293,19 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
     });
     resizeObserver.observe(container);
 
+    // Also listen for window resize as fallback (ResizeObserver might miss some cases)
+    let windowResizeTimeout: ReturnType<typeof setTimeout>;
+    const handleWindowResize = () => {
+      clearTimeout(windowResizeTimeout);
+      windowResizeTimeout = setTimeout(() => {
+        requestAnimationFrame(() => {
+          if (!container.isConnected) return;
+          fitTerminal();
+        });
+      }, 250);
+    };
+    window.addEventListener("resize", handleWindowResize);
+
     // Refit after mobile header auto-hides (3s delay + 0.3s transition)
     const headerHideTimeout = setTimeout(() => {
       fitTerminal();
@@ -322,8 +338,10 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
 
     return () => {
       clearTimeout(resizeTimeout);
+      clearTimeout(windowResizeTimeout);
       clearTimeout(headerHideTimeout);
       resizeObserver.disconnect();
+      window.removeEventListener("resize", handleWindowResize);
       document.removeEventListener("visibilitychange", handleVisibilityChange);
       if (ws) {
         ws.close();