feat: add auto update support

src/main/runtime/startup-tray-policy.test.ts

@@ -1,6 +1,9 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { shouldEnsureTrayOnStartupForInitialArgs } from './startup-tray-policy';
+import {
+  shouldEnsureTrayOnStartupForInitialArgs,
+  shouldQuitOnWindowAllClosedForTrayState,
+} from './startup-tray-policy';
 
 test('startup tray policy enables tray on Windows by default', () => {
   assert.equal(shouldEnsureTrayOnStartupForInitialArgs('win32', null), true);
@@ -18,3 +21,24 @@ test('startup tray policy skips tray for direct youtube playback on Windows', ()
 test('startup tray policy skips tray outside Windows', () => {
   assert.equal(shouldEnsureTrayOnStartupForInitialArgs('linux', null), false);
 });
+
+test('window-all-closed keeps tray-resident app alive', () => {
+  assert.equal(
+    shouldQuitOnWindowAllClosedForTrayState({ backgroundMode: false, hasTray: true }),
+    false,
+  );
+});
+
+test('window-all-closed quits non-background app without tray', () => {
+  assert.equal(
+    shouldQuitOnWindowAllClosedForTrayState({ backgroundMode: false, hasTray: false }),
+    true,
+  );
+});
+
+test('window-all-closed keeps background app alive without tray', () => {
+  assert.equal(
+    shouldQuitOnWindowAllClosedForTrayState({ backgroundMode: true, hasTray: false }),
+    false,
+  );
+});