fix(vst-bridge): reload VST3 on project open + bridge reconnect; GUI button ensure-load before open

- preloadTrackInstruments: also load VST3 tracks into bridge (no GUI) on project open
- onStatusChange(connected): reload all VST tracks after bridge restart/down recovery
- GUI button (track strip + piano roll): ensure-load then open — no white window when bridge restarted and instrument gone
- __bridgeLoadedChannels map: skip reload if already loaded (avoids plugin state reset); reset on bridge down
- piano roll: wrap Synth+GUI buttons in shrink-0 row so GUI stays on same line; compact track-strip GUI button

app/templates/index.html

@@ -50,7 +50,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608121800" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608132011" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {