fix: resolve Clippy -D warnings in Tauri client

- Remove unused `use tauri::Manager` in commands.rs
- Remove dead hotkeys.rs module (register_push_to_talk, unregister_all never called)
- Fix `mut cred` → immutable in credentials.rs (CredWriteW takes &CREDENTIALW)

Client/tauri-client/src-tauri/src/commands.rs

@@ -146,7 +146,6 @@ pub fn get_cert_fingerprint(
 pub fn open_devtools(_window: tauri::WebviewWindow) {
     #[cfg(feature = "devtools")]
     {
-        use tauri::Manager;
         _window.open_devtools();
     }
 }

Client/tauri-client/src-tauri/src/credentials.rs

@@ -79,7 +79,7 @@ pub fn save_credential(host: String, username: String, token: String, password:
     }
     let blob = payload.to_string().into_bytes();
 
-    let mut cred = CREDENTIALW {
+    let cred = CREDENTIALW {
         Flags: CRED_FLAGS(0),
         Type: CRED_TYPE_GENERIC,
         TargetName: PWSTR(target.as_ptr() as *mut u16),
@@ -95,7 +95,7 @@ pub fn save_credential(host: String, username: String, token: String, password:
     };
 
     unsafe {
-        CredWriteW(&mut cred, 0)
+        CredWriteW(&cred, 0)
             .map_err(|e| format!("CredWriteW failed: {e}"))?;
     }
 

Client/tauri-client/src-tauri/src/hotkeys.rs

@@ -1,35 +0,0 @@
-use tauri::{Emitter, Runtime};
-use tauri_plugin_global_shortcut::{GlobalShortcutExt, ShortcutState};
-
-/// Registers a global push-to-talk shortcut that emits `ptt-press` and
-/// `ptt-release` events to the frontend webview.
-pub fn register_push_to_talk<R: Runtime>(
-    app: &tauri::AppHandle<R>,
-    shortcut_str: &str,
-) -> Result<(), Box<dyn std::error::Error>> {
-    let shortcut: tauri_plugin_global_shortcut::Shortcut = shortcut_str.parse()?;
-
-    // Remove any previous binding for this shortcut before registering.
-    if app.global_shortcut().is_registered(shortcut) {
-        app.global_shortcut().unregister(shortcut)?;
-    }
-
-    let handle = app.clone();
-    app.global_shortcut().on_shortcut(shortcut, move |_app, _shortcut, event| {
-        let event_name = match event.state {
-            ShortcutState::Pressed => "ptt-press",
-            ShortcutState::Released => "ptt-release",
-        };
-        let _ = handle.emit(event_name, ());
-    })?;
-
-    Ok(())
-}
-
-/// Removes all registered global shortcuts.
-pub fn unregister_all<R: Runtime>(
-    app: &tauri::AppHandle<R>,
-) -> Result<(), Box<dyn std::error::Error>> {
-    app.global_shortcut().unregister_all()?;
-    Ok(())
-}

Client/tauri-client/src-tauri/src/lib.rs

@@ -1,6 +1,5 @@
 mod commands;
 mod credentials;
-mod hotkeys;
 mod livekit_proxy;
 mod ptt;
 mod tray;