Fix ⌘Q not quitting on macOS

The Quit item was role:"quit" with no accelerator, so ⌘Q was never
bound. Make it a custom action + accelerator "q" dispatched to
Utils.quit(), which emits before-quit so the existing guard (active
transfers / unsaved editors, native confirm dialog) runs instead of the
OS terminating directly. Handled before the manager-open check so ⌘Q
works with the connection manager open too.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/bun/menu.ts

@@ -42,7 +42,10 @@ export async function applyApplicationMenu(store: ConnectionStore): Promise<void
 				{ role: "hideOthers" },
 				{ role: "showAll" },
 				{ type: "separator" },
-				{ label: t("menu.quit"), role: "quit" },
+				// Custom action (not role:"quit") + explicit ⌘Q: routes through
+				// Utils.quit() so the before-quit guard (active transfers / unsaved
+				// editors) always runs instead of the OS terminating directly.
+				{ label: t("menu.quit"), action: "quit", accelerator: "q" },
 			],
 		},
 		{