fix(desktop): align runtime AppUserModelId with electron-builder appId

apps/desktop/tests/main/app-identity.test.ts

@@ -0,0 +1,32 @@
+import { describe, it, expect, vi } from 'vitest'
+import { readFileSync } from 'fs'
+import { resolve } from 'path'
+import { APP_NAME, APP_USER_MODEL_ID, applyAppIdentity } from '../../src/main/app-identity'
+
+const DESKTOP_ROOT = resolve(__dirname, '../..')
+
+function readBuilderAppId(): string {
+  const yml = readFileSync(resolve(DESKTOP_ROOT, 'electron-builder.yml'), 'utf-8')
+  const match = /^appId:\s*["']?([^"'\s#]+)["']?/m.exec(yml)
+  if (!match) throw new Error('electron-builder.yml에 top-level appId가 없다')
+  return match[1]
+}
+
+describe('app identity (AUMID SSOT)', () => {
+  it('런타임 AUMID가 electron-builder appId(설치본 바로가기 AUMID)와 같다', () => {
+    expect(APP_USER_MODEL_ID).toBe(readBuilderAppId())
+  })
+
+  it('applyAppIdentity는 앱 이름과 SSOT AUMID를 선언한다', () => {
+    const target = { setName: vi.fn(), setAppUserModelId: vi.fn() }
+    applyAppIdentity(target)
+    expect(target.setName).toHaveBeenCalledWith(APP_NAME)
+    expect(target.setAppUserModelId).toHaveBeenCalledWith(readBuilderAppId())
+  })
+
+  it('main 진입점은 AUMID 문자열을 하드코딩하지 않고 applyAppIdentity를 쓴다', () => {
+    const entry = readFileSync(resolve(DESKTOP_ROOT, 'src/main/index.ts'), 'utf-8')
+    expect(entry).toContain('applyAppIdentity(app)')
+    expect(entry).not.toMatch(/setAppUserModelId\(\s*['"`]/)
+  })
+})