refactor: remove obsolete RoomView state type

[diegolmello]

Proposed changes

Remove the obsolete IRoomViewState aggregate left over from the RoomView class component. The six Last Seen annotations now use Date | null directly, and member helpers reference the live RoomState owner while preserving member: any.

This is a three-file type/import cleanup with no runtime changes.

Issue(s)

Follow-up to #7482; targets its native-34-roomview-hooks branch.

How to test or reproduce

• pnpm format-lint passed, including TypeScript compilation.
• Existing RoomStore and useRoomInit suites passed.
• TZ=UTC pnpm test --runInBand --watchman=false passed: 315 suites, 2,896 tests, 426 snapshots.
• No remaining tracked-file references to IRoomViewState.

Screenshots

Not applicable; no visual changes.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

Existing tests are unchanged. Astra standards and specification reviews reported no findings.

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}