Make pasting reliable and turn items into checkboxes

Pasting still failed because the panel is a nonactivating panel: it can
be key while the app is not active, and menu key equivalents are not
delivered reliably in that state. Cmd+V is now dispatched to the
responder chain directly, and the app no longer replaces SwiftUI's main
menu — it only adds Hide Panel to it, so the Edit items that AppKit
routes text shortcuts through stay intact.

Rows also gained a checkbox so a workspace works as a checklist without
turning the row into a button, which would swallow the checkbox's clicks.

Sources/Prompt/App.swift

@@ -32,7 +32,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         // which locks the user out once the panel is hidden.
         if CommandLine.arguments.contains("--diag") {
             setupStatusItem()
-            setupMainMenu()
+            installMenuItems()
             DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                 self.writeDiagnostics()
                 NSApp.terminate(nil)
@@ -60,9 +60,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         HotkeyManager.shared.start()
 
         setupStatusItem()
-        setupMainMenu()
         promptForAccessibilityIfNeeded()
 
+        // Let SwiftUI finish installing its main menu, then augment it.
+        DispatchQueue.main.async { self.installMenuItems() }
+
         // Show the panel on launch so the app is discoverable (it has no Dock
         // icon and the menu bar icon can be hard to spot on a full bar).
         Task { @MainActor in
@@ -111,44 +113,24 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         return .terminateNow
     }
 
-    /// Accessory apps have no visible menu bar, but the main menu still
-    /// services key equivalents — this is what makes Cmd+Q and Cmd+W work
-    /// while the panel has focus.
-    ///
-    /// The Edit menu is not decoration: AppKit routes Cmd+C/V/X/A/Z through
-    /// these items, so a minimal main menu silently breaks pasting and
-    /// selecting in the composer.
-    private func setupMainMenu() {
-        let mainMenu = NSMenu()
+    /// Adds "Hide Panel" to the menu SwiftUI already installed. Do NOT replace
+    /// `NSApp.mainMenu`: SwiftUI's menu carries the Edit items that AppKit
+    /// routes Cmd+C/V/X/A/Z through, so replacing it breaks text editing in the
+    /// composer. This only inserts one item and drops SwiftUI's Settings item,
+    /// whose empty scene would otherwise shadow the in-panel Cmd+, sync panel.
+    private func installMenuItems() {
+        guard let appMenu = NSApp.mainMenu?.items.first?.submenu else { return }
 
-        let appMenuItem = NSMenuItem()
-        mainMenu.addItem(appMenuItem)
-        let appMenu = NSMenu(title: "Prompt")
-        appMenuItem.submenu = appMenu
+        if let settings = appMenu.items.firstIndex(where: { $0.keyEquivalent == "," && $0.keyEquivalentModifierMask == [.command] }) {
+            appMenu.removeItem(at: settings)
+        }
+        guard !appMenu.items.contains(where: { $0.action == #selector(hidePanel) }) else { return }
 
         let hide = NSMenuItem(title: "Hide Panel", action: #selector(hidePanel), keyEquivalent: "w")
         hide.target = self
-        appMenu.addItem(hide)
-        appMenu.addItem(.separator())
-        let quit = NSMenuItem(title: "Quit Prompt", action: #selector(quit), keyEquivalent: "q")
-        quit.target = self
-        appMenu.addItem(quit)
-
-        let editMenuItem = NSMenuItem()
-        mainMenu.addItem(editMenuItem)
-        let editMenu = NSMenu(title: "Edit")
-        editMenuItem.submenu = editMenu
-
-        editMenu.addItem(withTitle: "Undo", action: Selector(("undo:")), keyEquivalent: "z")
-        let redo = editMenu.addItem(withTitle: "Redo", action: Selector(("redo:")), keyEquivalent: "z")
-        redo.keyEquivalentModifierMask = [.command, .shift]
-        editMenu.addItem(.separator())
-        editMenu.addItem(withTitle: "Cut", action: #selector(NSText.cut(_:)), keyEquivalent: "x")
-        editMenu.addItem(withTitle: "Copy", action: #selector(NSText.copy(_:)), keyEquivalent: "c")
-        editMenu.addItem(withTitle: "Paste", action: #selector(NSText.paste(_:)), keyEquivalent: "v")
-        editMenu.addItem(withTitle: "Select All", action: #selector(NSText.selectAll(_:)), keyEquivalent: "a")
-
-        NSApp.mainMenu = mainMenu
+        let quitIndex = appMenu.items.firstIndex { $0.action == #selector(NSApplication.terminate(_:)) } ?? appMenu.items.count
+        appMenu.insertItem(.separator(), at: quitIndex)
+        appMenu.insertItem(hide, at: quitIndex + 1)
     }
 
     @MainActor @objc private func hidePanel() {