feat(electrobun): native C resize lib + stub test page + deferred init

- agor_resize.c: C library with GTK signal handlers for resize
- native-resize.ts: Bun FFI wrapper for libagor-resize.so
- resize-test.html: minimal stub for isolating resize behavior
- index.ts: native resize disabled pending stability testing
- RESIZE_TEST env var for loading stub page via Vite

ui-electrobun/src/bun/index.ts

@@ -202,6 +202,13 @@ relayClient.onStatus((machineId, status, error) => {
 // ── App window ────────────────────────────────────────────────────────────
 
 async function getMainViewUrl(): Promise<string> {
+  // TEMPORARY: load resize test stub via Vite dev server (keeps RPC bridge)
+  const RESIZE_TEST = false; // DISABLED — use normal app for now
+  if (RESIZE_TEST) {
+    const testUrl = DEV_SERVER_URL + "/resize-test.html";
+    console.log(`[RESIZE_TEST] Loading stub via Vite: ${testUrl}`);
+    return testUrl;
+  }
   const channel = await Updater.localInfo.channel();
   if (channel === "dev") {
     try {
@@ -237,12 +244,9 @@ mainWindow = new BrowserWindow({
   },
 });
 
-// Native resize via C shared library (libagor-resize.so)
-// Owns GTK signal connections in C — no JSCallback boundary crossing
-try {
-  const { initNativeResize } = require("./native-resize.ts");
-  initNativeResize((mainWindow as any).ptr, 8);
-} catch (e) { console.error("[native-resize] init failed:", e); }
+// Native resize COMPLETELY DISABLED for stability testing
+// TODO: re-enable after verifying the app starts without it
+console.log("[native-resize] DISABLED — testing app startup stability");
 
 // Prevent GTK's false Ctrl+click detection from closing the window on initial load.
 // WebKitGTK reports stale modifier state (0x14 = Ctrl+Alt) after SIGTERM of previous instance,