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test(app): migrate tests to Vitest (#10355)

* test(app): migrate tests to Vitest

- Replaced legacy Karma and Mocha runners with unified Vitest runner extending config/vitest.base.mjs
- Added src/types/vitest-globals.d.ts for ambient globals
- Standardized package test scripts to pure vitest commands
- Migrated global defaults access to globalThis in api.test.ts to support browser runner
- Migrated sealed ESM module stub to class prototype method stub in heartbeatService.test.ts
- Migrated legacy Mocha before hooks directly to beforeAll
- Deleted deprecated karma.conf.js

CI Impact:
• Test Count: 168 passed (84 Node + 84 Browser Chromium)
• Execution Time: 2.44s total runtime

* fix(app): address review comments on PR 10355

- Wrap globalThis.__FIREBASE_DEFAULTS__ in try/finally to prevent state leakage
- Use dedicated sinon sandbox for suite-level stubs restored in afterAll
- Use it.skipIf for IndexedDB-dependent test in Node

* refactor(app): remove obsolete nyc config from package.json

* refactor(app): replace AppError enum with as const object and string literal type

* refactor(app): restore const enum AppError to preserve bundle size and downstream compatibility

* test(app): migrate test suites to native Vitest and remove legacy Sinon-Chai patterns

- Replace legacy Chai and Sinon assertion chains with native Vitest matchers
- Replace Sinon stubs, spies, and fake timers with vi.spyOn, vi.fn, and vi.useFakeTimers
- Replace match.any and match(predicate) with expect.anything() and expect.stringContaining()
- Update test/setup.ts to configure vi.useRealTimers() and vi.restoreAllMocks() in afterEach

* test(app): stub storage overwrite and console methods to avoid indexeddb and silence test logs

10833 of 16169 branches covered (67.0%)

Branch coverage included in aggregate %.

29847 of 35151 relevant lines covered (84.91%)

44390.41 hits per line