Premium Analytics: add Stats email summary endpoint

[kangzj]

Fixes #

Proposed changes

• Add Premium Analytics data package support for the Stats email summary endpoint, following the Stats endpoint patterns established in Premium Analytics: add Stats endpoint foundation #49886.
• Wire the endpoint-specific query, hook, public exports, and sanitizer/normalizer registration where applicable.
• Keep endpoint typing tied to sanitizer keys or passthrough query inference, with focused fixtures/tests for the raw endpoint payload shape where normalization is introduced.

Related product discussion/links

• Builds on Premium Analytics: add Stats endpoint foundation #49886.

Does this pull request change what data or activity we track or use?

No. This only adds typed client data/query integration for an existing Stats API endpoint.

Testing instructions

• pnpm --dir projects/packages/premium-analytics test -- packages/data/src/queries/tests/stats-queries.test.ts packages/data/src/hooks/tests/stats-exports.test.ts --runInBand
• pnpm exec eslint --max-warnings=0
• pnpm --dir projects/packages/premium-analytics run typecheck
• git diff --check

[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report

[github-actions]

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[kangzj]

Review-cycle audit summary

No blocking reviewer feedback is open. Latest invited reviewer feedback is non-blocking, required checks report none for this branch, and the PR is ready with [Status] Needs Team Review.

Audit details

• Branch: endpoint/stats-email-summary-endpoint
• Base: endpoint/stats-endpoint-foundation
• Head checked: 3b53fd8224c4cda694bbbdeefc6e2412b1dad0a0
• Changes pushed during this audit: none
• Addressable open comments: none
• Unaddressed human comments: none
• Required checks: none reported by GitHub