88162: Reports page - Custom report title briefly shows'Chat Report' when clicking a report row

[abbasifaizan70]

Explanation of Change

I changed openReport so optimistic Onyx updates only set reportName when a real existing name is already present, instead of falling back to DEFAULT_REPORT_NAME ("Chat Report").
This prevents the temporary overwrite to "Chat Report" during navigation, so the custom formula-based title no longer flickers before the API response restores it.

Fixed Issues

$ #88162
PROPOSAL: #88162 (comment)

Tests

• Verify that no errors appear in the JS console

1. Open New Expensify (Web)
2. Go to the Reports page
3. Set up a report with a custom report title (via title formula)
4. Click on a report row to open the report
5. When clicking on a report row, verify that the custom report title is not changed to "Chat Report" before reverting to the correct custom title once the report loads.

Offline tests

Same as tests.

QA Steps

Same as tests.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native

Screen.Recording.2026-05-06.at.2.26.20.AM.mov

Android: mWeb Chrome

Screen.Recording.2026-05-06.at.2.25.31.AM.mov

iOS: Native

Screen.Recording.2026-05-06.at.2.17.07.AM.mov

iOS: mWeb Safari

Screen.Recording.2026-05-06.at.2.18.21.AM.mov

MacOS: Chrome / Safari

Screen.Recording.2026-05-06.at.2.09.58.AM.mp4

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[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
src/libs/actions/Report/index.ts	69.89% <100.00%> (-0.15%)	⬇️
... and 10 files with indirect coverage changes