Fix fragment.text literal and close search RHP after deleting last message

[WojtekBoman]

Explanation of Change

Fixes the "fragment.text" literal showing in chat after deleting a thread conversation: the default case in ReportActionItemFragment now renders {fragment?.text ?? ''} instead of the literal string. Additionally, in deleteReportComment, when a report shown in the search RHP (/search/view/:reportID) has no visible actions left after deletion, we pop that RHP screen (keeping any wider RHP below open).

Screen.Recording.2026-06-03.at.17.09.44.mov

Fixed Issues

$ #91603
PROPOSAL:

Tests

1. Go to a workspace chat and create two expenses.
2. Go to Spend > Reports and open the report.
3. Open any expense, then send a message in the transaction thread.
4. Right click the message > Reply in thread, and send a reply in the thread.
5. Delete the parent message (right click > Delete comment), then delete the thread reply (right click > Delete comment).
6. Verify that "fragment.text" does NOT appear anywhere after deleting the thread conversation.
7. Verify that once the last visible message in the report opened via /search/view/:reportID is deleted, that RHP screen closes automatically (instead of showing an empty report).
8. With a wider RHP (e.g. expense details) stacked below the search report view, repeat step 7 and verify that only the top report screen is popped while the wider RHP underneath remains open.

• Verify that no errors appear in the JS console

Offline tests

1. Go offline.
2. Open a report via Spend > Reports (/search/view/:reportID) and delete its last visible message.
3. Verify that the RHP screen is popped and "fragment.text" never appears.
4. Go back online and verify the deletion persists and the UI stays consistent.

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
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[melvin-bot]

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