refactor(firestore): improve firestore types and add test

[ycmjason]

Description

#8611 flaged that many types are currently broken.

This PR fixes most of the type issues by removing <AppModelType, DbModelType> and replaced with <T extends DocumentData>.

Also added tsd to make sure our .d.ts are legit. Fixed many issues thanks to it!

Related issues

#8611

Release Summary

Fix types for firestore

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

Added tsd to add some type testings to our apis.

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Project	Deployment	Preview	Comments	Updated (UTC)
react-native-firebase	Ready	Preview	Comment	Sep 16, 2025 8:49am