fix(updater): handle unsupported macOS app updates

src/main/runtime/update/update-dialogs.test.ts

@@ -1,6 +1,10 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { createUpdateDialogPresenter, type ShowMessageBox } from './update-dialogs';
+import {
+  createUpdateDialogPresenter,
+  showManualUpdateRequiredDialog,
+  type ShowMessageBox,
+} from './update-dialogs';
 
 test('update dialog presenter focuses app before showing macOS dialogs', async () => {
   const calls: string[] = [];
@@ -35,3 +39,26 @@ test('update dialog presenter does not focus app before showing non-macOS dialog
 
   assert.deepEqual(calls, ['dialog:SubMiner is up to date (v0.14.0)']);
 });
+
+test('manual update required dialog explains that automatic install is unavailable', async () => {
+  let shown:
+    | {
+        type?: string;
+        title?: string;
+        message: string;
+        detail?: string;
+        buttons?: string[];
+      }
+    | undefined;
+  const showMessageBox: ShowMessageBox = async (options) => {
+    shown = options;
+    return { response: 0 };
+  };
+
+  await showManualUpdateRequiredDialog(showMessageBox, '0.15.0-beta.1');
+
+  assert.equal(shown?.type, 'warning');
+  assert.equal(shown?.message, 'Manual install required');
+  assert.match(shown?.detail ?? '', /SubMiner v0\.15\.0-beta\.1 is available/);
+  assert.match(shown?.detail ?? '', /cannot install app updates automatically/);
+});