## Summary
- Add `hasCheckedReleaseNotes` ref to track whether release notes have
already been checked in the current session
- Prevent the useEffect from running multiple times due to
settings/appVersion dependency changes
- Refactor conditional logic to use early-return pattern for improved
readability

## Test plan
- Open the app and navigate to Home page
- Verify release notes dialog only shows once per session when there are
new release notes
- Confirm no duplicate API calls to `doesReleaseNoteExist`

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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---------
Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>