fix: GUI VST native window qua bridge + audio path bridge (SF2 preview/play câm)

- open_vst_gui: bo WebviewWindowBuilder/thread, chi push_control type=4 (hwnd=0 -> bridge tao window)
- main.cpp: create_native_vst_window (class SonicForge_Native_VST3_Class, 800x600, khong TOPMOST),
  tao trong ChannelWorker job, map guiWindows, capture arg2 by value (fix dangling)
- app.jsx: guard isBridgeActive() 8 cho -> bridge active thi moi note di router -> pushEvent -> bridge
  (truoc day SF2 cam vi HAS_PYFLUIDSYNTH=FALSE -> /soundfont-render 501; VST3 path cu dung nativeSf/Carla)
- E2E: SF2 NOTE_ON qua dispatchMidiEvent -> SHM peak 0.029745; Nexus GUI native hwnd OK (license/preset)
- docs: TASKS.md + TEST_NOTES.md ghi batch fix + ket qua; gitignore vendor/junk

src-tauri/src/shm.rs

@@ -8,7 +8,7 @@ use std::ffi::c_void;
 use std::ptr;
 use std::sync::Mutex;
 use windows_sys::Win32::Foundation::{CloseHandle, HANDLE};
-use windows_sys::Win32::System::MemoryManagement::{
+use windows_sys::Win32::System::Memory::{
     CreateFileMappingW, MapViewOfFile, UnmapViewOfFile, FILE_MAP_ALL_ACCESS, PAGE_READWRITE,
 };
 
@@ -83,13 +83,13 @@ impl Shm {
             return None;
         }
         let view = unsafe { MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0) };
-        if view.is_null() {
+        if view.Value.is_null() {
             unsafe { CloseHandle(handle) };
             return None;
         }
         Some(Shm {
             handle,
-            view: view as *mut SharedAudioBufferIPC,
+            view: view.Value as *mut SharedAudioBufferIPC,
         })
     }
 
@@ -156,7 +156,7 @@ impl Shm {
 impl Drop for Shm {
     fn drop(&mut self) {
         if !self.view.is_null() {
-            unsafe { UnmapViewOfFile(self.view as *const c_void) };
+            unsafe { UnmapViewOfFile(windows_sys::Win32::System::Memory::MEMORY_MAPPED_VIEW_ADDRESS { Value: self.view as *mut c_void }) };
         }
         unsafe { CloseHandle(self.handle) };
     }
@@ -164,3 +164,15 @@ impl Drop for Shm {
 
 /// Process-wide shared-memory state for Tauri.
 pub struct ShmState(pub Mutex<Option<Shm>>);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn layout_matches_c_header() {
+        // native_bridge/tests/shm_selfcheck.cpp asserts the same sizes.
+        assert_eq!(std::mem::size_of::<MidiEventIPC>(), 12);
+        assert_eq!(std::mem::size_of::<ControlEventIPC>(), 1040);
+        assert_eq!(std::mem::size_of::<SharedAudioBufferIPC>(), 11160);
+    }
+}