feat(vst-gui): open VST3 GUI while playing (level 1)

- main.cpp: drop transportStopped defer in handleOpenGui (G0.1 legacy);
  G0.1b setReloading-before-job + single UiThread (G1.2) block the
  2-thread-1-DLL race. GUI opens immediately during PLAY, short mute
  (~0.1-0.3s first time, hasAttachedOnce_ false so reloadForGUI skips
  reload); notes already sounding are kept. Reopen after close still
  reloads (1-3s mute) - level 2 not feasible.
- app.jsx: remove !isPlayingRef.current guard before openNativeGUI in
  loadTrackInstrumentToBridge.
- rebuild app.precompiled.js + daw_vst_bridge.exe.

native_bridge/src/main.cpp

@@ -796,19 +796,14 @@ int main(int argc, char* argv[]) {
             })) {
             return;
         }
-        // G0.1 (BUG_REPORT): mo GUI khi dang PLAY -> attachView chay tren worker
-        // thread trong luc audio loop process() cung DLL (2 thread 1 plugin) ->
-        // Nexus throw (createView/attached) -> GUI khong load + retry spam ->
-        // stall 3s -> watchdog kill bridge -> mat het instrument -> cam. Defer
-        // OPEN_GUI toi khi transport STOP (sweep duoi fulfill khi loaded &&
-        // transportStopped). Khong doi: tranh mat am; user STOP la GUI tu mo.
-        if (!transportStopped) {
-            std::cerr << "[NativeBridge] GUI deferred ch=" << guiCh
-                      << " plugin=" << pluginId << " (transport PLAY) - queued" << std::endl;
-            std::lock_guard<std::mutex> lock(g_pendingGuiMutex);
-            g_pendingGui[guiCh] = { (void*)arg1, pluginId };
-            return;
-        }
+        // G0.1 (historical): mo GUI khi dang PLAY bi defer toi khi STOP vi 2
+        // thread 1 plugin (audio loop process + attach worker) -> Nexus throw.
+        // LEVEL-1 (2026-08-15): bo defer. G0.1b (setReloading tren MAIN thread
+        // truoc job, o duoi) da silence same-path channels va G1.2 (1 UiThread,
+        // audio loop khong pump window messages) chan race 2 thread 1 DLL.
+        // GUI mo ngay khi play; mute ngan (~0.1-0.3s lan dau: hasAttachedOnce_
+        // false nen reloadForGUI khong reload, Vst3Instrument.cpp 688). Note
+        // dang ngan khong mat. Reopen sau khi dong VAN reload (1-3s mute).
         // G1.2: window + attach chay tren UiThread (1 thread chung, COM STA +
         // message pump + job queue). Window messages do UiThread pump dispatch —
         // audio loop khong con PeekMessageW (xoa block pump o main loop).