fix(electrobun): use setPosition+setSize instead of setFrame, add resize throttle

ui-electrobun/src/bun/index.ts

@@ -121,7 +121,13 @@ const rpc = BrowserView.defineRPC<PtyRPCSchema>({
       "window.getFrame": () => { try { return mainWindow.getFrame(); } catch { return { x: 0, y: 0, width: 1400, height: 900 }; } },
       "window.setPosition": ({ x, y }: { x: number; y: number }) => { try { mainWindow.setPosition(x, y); return { ok: true }; } catch { return { ok: false }; } },
       "window.setFrame": ({ x, y, width, height }: { x: number; y: number; width: number; height: number }) => {
-        try { mainWindow.setFrame(x, y, width, height); return { ok: true }; } catch (err) { console.error("[window.setFrame]", err); return { ok: false }; }
+        try {
+          // Use separate setPosition + setSize — setFrame's C implementation
+          // may not resize on GTK with titleBarStyle:"hidden"
+          mainWindow.setPosition(x, y);
+          mainWindow.setSize(width, height);
+          return { ok: true };
+        } catch (err) { console.error("[window.setFrame]", err); return { ok: false }; }
       },
     },
     messages: {},

ui-electrobun/src/mainview/App.svelte

@@ -144,8 +144,13 @@
     e.preventDefault();
     e.stopPropagation();
   }
+  let resizeThrottleId = 0;
   function onResizeMove(e: MouseEvent) {
     if (!isResizing || !resizeReady) return;
+    // Throttle to ~30fps to avoid overwhelming GTK
+    const now = Date.now();
+    if (now - resizeThrottleId < 33) return;
+    resizeThrottleId = now;
     const dx = e.screenX - resizeStartX;
     const dy = e.screenY - resizeStartY;
     let { x, y, width, height } = resizeFrame;