[codex] Isolate Windows helper tests from Firebase

[tianmind-studio]

Summary

• Mock unused API client imports in pure Windows renderer helper tests.
• Mock the agent LLM import in goal helper tests.
• Keep these tests from initializing Firebase Auth during Vitest collection.

Why

These tests exercise prompt builders, parsers, and tag helpers, but importing the modules also pulled in apiClient / agentLLM, which initializes Firebase Auth through firebase.ts. On a fresh Windows test run without real Vite Firebase env values, Vitest failed at collection with FirebaseError: Firebase: Error (auth/invalid-api-key) before assertions could run.

Validation

• Before the fix: npx --yes pnpm@11.6.0 test failed 4 suites with auth/invalid-api-key.
• npx --yes pnpm@11.6.0 exec vitest run src/renderer/src/lib/appMemories.test.ts src/renderer/src/lib/calendarExtract.test.ts src/renderer/src/lib/gmailExtract.test.ts src/renderer/src/lib/goals.test.ts -> 4 files passed, 18 tests passed.
• npx --yes pnpm@11.6.0 test -> 76 files passed, 1 skipped; 508 tests passed, 3 skipped.
• npx --yes pnpm@11.6.0 run typecheck -> passed.
• npx --yes pnpm@11.6.0 exec prettier --check src/renderer/src/lib/appMemories.test.ts src/renderer/src/lib/calendarExtract.test.ts src/renderer/src/lib/gmailExtract.test.ts src/renderer/src/lib/goals.test.ts -> passed.
• git diff --check -> passed.

Note

npx --yes pnpm@11.6.0 run lint still fails on this Windows checkout because of existing CRLF Prettier warnings and pre-existing lint errors outside these changed files; this PR keeps scope to the Firebase import-time test failure.