fix(audio,windows): init_tx is SyncSender not Sender (windows-only build fix)

run_raw_input_loop / run_hook_loop signatures used Sender<bool>
but the callers create the channel via sync_channel which returns
SyncSender. Linux cross-check missed this because windows.rs is
behind #[cfg(target_os = "windows")].

crates/chanora_audio/src/ptt_backends/windows.rs

@@ -370,7 +370,7 @@ impl Drop for WindowsRawInputBackend {
 /// # Safety
 /// Calls into Win32 directly. Must be invoked on the thread that
 /// owns the message window (created here).
-unsafe fn run_raw_input_loop(init_tx: std::sync::mpsc::Sender<bool>) -> bool {
+unsafe fn run_raw_input_loop(init_tx: std::sync::mpsc::SyncSender<bool>) -> bool {
     // Helper that signals the readiness state to the main thread.
     // We send exactly once at the first decisive moment (either an
     // early-fail return or right after a successful
@@ -795,7 +795,7 @@ impl Drop for WindowsHookBackend {
 /// # Safety
 /// Calls Win32 directly; must run on the thread that owns the
 /// hook handles.
-unsafe fn run_hook_loop(init_tx: std::sync::mpsc::Sender<bool>) -> bool {
+unsafe fn run_hook_loop(init_tx: std::sync::mpsc::SyncSender<bool>) -> bool {
     let mut signal = Some(init_tx);
     macro_rules! report {
         ($v:expr) => {