Fix bulk merge post-merge navigation to open target thread report

[marufsharifi]

Explanation of Change

Bulk expense merge now follows the same destination behavior as individual merge.

Before this update, bulk merge from Reports > Expenses could open the wrong place (for example, self-DM) after merge because the app sometimes lost the intended transaction-thread destination during the multi-step merge flow.

Now, the app determines the correct target transaction thread earlier in the merge process and carries that destination through to confirmation. That makes post-merge navigation consistent and predictable across flows, especially when merging workspace and self-DM expenses from search.

follow-up of #79766

Fixed Issues

$ #83257
PROPOSAL:

Tests

1. Create an expense in self DM.

2. Create an expense in workspace chat.

3. Go to Reports > Expenses.

4. Select the workspace expense via the checkbox.

5. Click the dropdown button > Merge.

6. Select self DM expense > Continue.

7. Select the second option in each section > Next > Merge expenses.

8. Verify the transaction thread is open after merging expenses via the bulk option

• Verify that no errors appear in the JS console

Offline tests

Same as Tests.

QA Steps

Same as Tests.

// TODO: These must be filled out, or the issue title must include "[No QA]."

• 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
  • I added steps for Staging and/or Production testing in the QA steps section
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  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
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Screenshots/Videos

Android: Native

android.native.mp4

Android: mWeb Chrome

android.web.mp4

iOS: Native

Screen.Recording.2026-03-06.at.5.49.31.PM.mov

iOS: mWeb Safari

Screen.Recording.2026-03-06.at.5.52.45.PM.mov

MacOS: Chrome / Safari

web.mp4

[marufsharifi]

PR changes:

• Persisted targetTransactionThreadReportID in merge flow state during setup in setupMergeTransactionDataAndNavigate() so destination is resolved early and remains stable across merge steps.
• Updated confirmation navigation to prioritize the persisted thread report ID from merge state before runtime fallback resolution.
• Threaded isOnSearch through MergeTransactionsListPage → MergeTransactionsListContent → setupMergeTransactionDataAndNavigate for consistent search-context behavior in bulk flow.
• Extended MergeTransaction Onyx type with optional targetTransactionThreadReportID to support this explicit destination handoff.

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/libs/actions/MergeTransaction.ts	71.06% <100.00%> (+12.57%)	⬆️
.../TransactionMerge/MergeTransactionsListContent.tsx	0.00% <ø> (ø)
...ges/TransactionMerge/MergeTransactionsListPage.tsx	0.00% <ø> (ø)
src/pages/TransactionMerge/ConfirmationPage.tsx	0.00% <0.00%> (ø)
... and 14 files with indirect coverage changes

[melvin-bot]

@rojiphil Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[marufsharifi]

@rojiphil, thanks for your patience the pr is ready for your review. The failure unit test doesn't seem related to my changes, btw. thanks.

[marufsharifi]

@rojiphil, kindly bump. thanks.

[joekaufmanexpensify]

👍

[rojiphil]

@marufsharifi There are two issues which needs fix:

1. While the issue for Reports->Expenses->Expense via Checkbox is fixed, we would still face with the same problem for Reports->Reports->Expense via Checkbox.
2. While testing for merge in Inbox->Report->Expense, the thread report is shown (main view navigates to Reports) which needs a fix. The staging navigates to self DM as expected.

Attaching staging and pr version test videos for reference.

83825-pr-issues.mp4

83825-staging-issues.mp4

[marufsharifi]

Sorry for the delay, I will try to update this tomorrow.

[marufsharifi]

Sorry for the delay i was OOO, i will update here today. Thanks.

[marufsharifi]

I've fixed the case where we select more than one expense from bulk actions, then merge. But for one expense selected from bulk action, it sometimes doesn't work. I will update here tomorrow. Thanks for your patience.