feat(account settings): Add signout functionality (#16)

* Create account.vue with logout button

* Update auth.rs to add signout command

* Update lib.rs to pass sign_out command to frontend

src-tauri/src/auth.rs

@@ -232,3 +232,29 @@ pub fn setup() -> Result<(AppStatus, Option<User>), ()> {
 
     Ok((AppStatus::SignedOut, None))
 }
+
+#[tauri::command]
+pub fn sign_out(app: AppHandle) -> Result<(), String> {
+    info!("Signing out user");
+    
+    // Clear auth from database
+    {
+        let mut handle = DB.borrow_data_mut().unwrap();
+        handle.auth = None;
+        drop(handle);
+        DB.save().unwrap();
+    }
+
+    // Update app state
+    {
+        let app_state = app.state::<Mutex<AppState>>();
+        let mut app_state_handle = app_state.lock().unwrap();
+        app_state_handle.status = AppStatus::SignedOut;
+        app_state_handle.user = None;
+    }
+
+    // Emit event for frontend
+    app.emit("auth/signedout", ()).unwrap();
+
+    Ok(())
+}