fix(electrobun): GTK FFI direct resize via gtk_window_resize/move

Electrobun's setSize respects WebView min-size constraint. Bypass it
with direct gtk_window_resize() + gtk_window_move() FFI calls.
clearMinSizeTree() runs on every resize frame to suppress WebView
re-propagation. gtkSetFrame() exported as new RPC endpoint.

ui-electrobun/src/mainview/App.svelte

@@ -148,7 +148,8 @@
     if (resizeEdge.includes('s')) height = Math.max(MIN_H, height + dy);
     if (resizeEdge.includes('n')) { const nh = Math.max(MIN_H, height - dy); y += height - nh; height = nh; }
 
-    appRpc.request['window.setFrame']({ x: Math.round(x), y: Math.round(y), width: Math.round(width), height: Math.round(height) }).catch(() => {});
+    // Use GTK FFI directly — bypasses Electrobun's setSize which respects WebView min-size
+    appRpc.request['window.gtkSetFrame']({ x: Math.round(x), y: Math.round(y), width: Math.round(width), height: Math.round(height) }).catch(() => {});
   }
 
   function onResizeEnd() {