Remove CSD titlebar buttons, fix tray toggle and quit

- Replace GTK header bar with buttonless version to work around
  upstream bug where CSD buttons become non-interactive after
  hide()/show() (tauri-apps/tauri#11856, tauri-apps/tao#1046)
- Tray menu now toggles between "Hide Claude" / "Show Claude"
- Left-click tray icon toggles window visibility
- Fix quit from tray (use std::process::exit to bypass keep-alive)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/Cargo.lock

@@ -451,6 +451,7 @@ dependencies = [
 name = "claude-app"
 version = "1.0.0"
 dependencies = [
+ "gtk",
  "serde",
  "serde_json",
  "tauri",

src-tauri/Cargo.toml

@@ -15,6 +15,9 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 url = "2"
 
+[target.'cfg(target_os = "linux")'.dependencies]
+gtk = { version = "0.18", features = ["v3_24"] }
+
 [features]
 default = ["custom-protocol"]
 custom-protocol = ["tauri/custom-protocol"]

src-tauri/src/lib.rs

@@ -97,11 +97,10 @@ pub fn run() {
         .plugin(tauri_plugin_opener::init())
         .invoke_handler(tauri::generate_handler![send_notification])
         .setup(|app| {
-            // -- Create main window navigating directly to claude.ai --
+            // NOTE: Decorations disabled due to upstream bug where CSD titlebar
-            //
+            // buttons become non-interactive after hide()/show() on Linux.
-            // on_navigation and on_new_window are builder methods, so they must
+            // Tracked at: https://github.com/tauri-apps/tauri/issues/11856
-            // be chained before .build(). The close-to-tray handler is set on
+            //             https://github.com/tauri-apps/tao/issues/1046
-            // the built window via on_window_event.
             let webview_window = WebviewWindowBuilder::new(
                 app,
                 "main",
@@ -110,6 +109,7 @@ pub fn run() {
             .title("Claude")
             .inner_size(1200.0, 800.0)
             .min_inner_size(400.0, 300.0)
+            .resizable(true)
             // Standard WebKit user agent so claude.ai serves the full experience
             .user_agent("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15")
             .initialization_script(NOTIFICATION_BRIDGE_JS)
@@ -124,38 +124,71 @@ pub fn run() {
             })
             .build()?;
 
-            // -- Close-to-tray: hide window instead of quitting --
+            // Replace the default GTK header bar with one that has no buttons.
-            let win_clone = webview_window.clone();
+            // The standard CSD buttons become non-interactive after hide()/show()
-            webview_window.on_window_event(move |event| {
+            // due to upstream bug: https://github.com/tauri-apps/tauri/issues/11856
-                if let WindowEvent::CloseRequested { api, .. } = event {
+            #[cfg(target_os = "linux")]
-                    api.prevent_close();
+            {
-                    let _ = win_clone.hide();
+                use gtk::prelude::*;
+                if let Ok(gtk_win) = webview_window.gtk_window() {
+                    let header = gtk::HeaderBar::new();
+                    header.set_show_close_button(false);
+                    header.set_title(Some("Claude"));
+                    header.show();
+                    gtk_win.set_titlebar(Some(&header));
+                }
             }
-            });
 
             // -- System tray --
-            let show_item =
+            let toggle_item =
-                MenuItem::with_id(app, "show", "Show Claude", true, None::<&str>)?;
+                MenuItem::with_id(app, "toggle", "Hide Claude", true, None::<&str>)?;
             let quit_item =
                 MenuItem::with_id(app, "quit", "Quit", true, None::<&str>)?;
-            let menu = Menu::with_items(app, &[&show_item, &quit_item])?;
+            let menu = Menu::with_items(app, &[&toggle_item, &quit_item])?;
 
             let tray_icon = Image::from_bytes(include_bytes!("../icons/32x32.png"))?;
 
+            fn show_window(win: &tauri::WebviewWindow, toggle: &MenuItem<tauri::Wry>) {
+                let _ = win.show();
+                let _ = win.set_focus();
+                let _ = toggle.set_text("Hide Claude");
+            }
+
+            fn hide_window(win: &tauri::WebviewWindow, toggle: &MenuItem<tauri::Wry>) {
+                let _ = win.hide();
+                let _ = toggle.set_text("Show Claude");
+            }
+
+            // -- Close-to-tray: hide window instead of quitting --
+            let win_for_close = webview_window.clone();
+            let toggle_for_close = toggle_item.clone();
+            webview_window.on_window_event(move |event| {
+                if let WindowEvent::CloseRequested { api, .. } = event {
+                    api.prevent_close();
+                    hide_window(&win_for_close, &toggle_for_close);
+                }
+            });
+
+            let toggle_for_menu = toggle_item.clone();
+            let toggle_for_tray = toggle_item.clone();
             let tray_handle = app.handle().clone();
             TrayIconBuilder::new()
                 .icon(tray_icon)
                 .tooltip("Claude")
                 .menu(&menu)
                 .on_menu_event(move |app_handle, event| match event.id().as_ref() {
-                    "show" => {
+                    "toggle" => {
                         if let Some(win) = app_handle.get_webview_window("main") {
-                            let _ = win.show();
+                            let visible = win.is_visible().unwrap_or(false);
-                            let _ = win.set_focus();
+                            if visible {
+                                hide_window(&win, &toggle_for_menu);
+                            } else {
+                                show_window(&win, &toggle_for_menu);
+                            }
                         }
                     }
                     "quit" => {
-                        app_handle.exit(0);
+                        std::process::exit(0);
                     }
                     _ => {}
                 })
@@ -166,8 +199,12 @@ pub fn run() {
                     } = event
                     {
                         if let Some(win) = tray_handle.get_webview_window("main") {
-                            let _ = win.show();
+                            let visible = win.is_visible().unwrap_or(false);
-                            let _ = win.set_focus();
+                            if visible {
+                                hide_window(&win, &toggle_for_tray);
+                            } else {
+                                show_window(&win, &toggle_for_tray);
+                            }
                         }
                     }
                 })