macOS application menu

Standard menus (App: hide/quit; Edit: clipboard roles enabling Cmd+C/V/X/Z;
View: Refresh Cmd+R + fullscreen; Window: minimize/zoom/cycle) plus File with
New/Close Tab (Cmd+T/W), New Folder/File, and a Connect submenu built from
saved connections (folders as nested submenus, Connection Manager entry).
Custom actions forward to the webview as menuAction messages; the menu rebuilds
whenever connections change. macOS-only per electrobun support.

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

src/bun/index.ts

@@ -1,7 +1,8 @@
-import { BrowserWindow, Updater } from "electrobun/bun";
+import { ApplicationMenu, BrowserWindow, Updater } from "electrobun/bun";
 import { BRANDING } from "../shared/branding";
 import { effectiveConcurrency } from "../shared/types";
 import { SessionRegistry } from "./fs/registry";
+import { applyApplicationMenu } from "./menu";
 import { createAppRPC } from "./rpc-handlers";
 import { ConnectionStore } from "./store/connections";
 import { SettingsStore } from "./store/settings";
@@ -31,7 +32,10 @@ const registry = new SessionRegistry();
 const engine = new TransferEngine(registry);
 const store = new ConnectionStore();
 const settings = new SettingsStore();
-const events = { sessionClosed: (_info: { sessionId: string; reason: string }) => {} };
+const events = {
+	sessionClosed: (_info: { sessionId: string; reason: string }) => {},
+	connectionsChanged: () => {},
+};
 const rpc = createAppRPC({ registry, engine, store, settings, events });
 const url = await getMainViewUrl();
 
@@ -59,6 +63,13 @@ new BrowserWindow({
 
 engine.onUpdate = (snapshot) => rpc.send.transferUpdate(snapshot);
 events.sessionClosed = (info) => rpc.send.sessionClosed(info);
+events.connectionsChanged = () => void applyApplicationMenu(store);
 void settings.load().then((s) => engine.setConcurrency(effectiveConcurrency(s)));
 
+void applyApplicationMenu(store);
+ApplicationMenu.on("application-menu-clicked", (event) => {
+	const action = (event as { data?: { action?: string } }).data?.action;
+	if (action) rpc.send.menuAction({ action });
+});
+
 console.log(`${BRANDING.appName} started (${url})`);