Perf: Defer Search/Reports list mount via NavigationDeferredMount

[dariusz-biela]

Explanation of Change

Warm start of the Reports/Search page (first render in a session, data already cached) takes ~550ms (Mac M4 Pro) because we wait for the full list to render before showing anything to the user. This PR applies NavigationDeferredMount to that path so the warm start behaves like a cold start visually:

• On first mount of SearchPage, a SearchRowSkeleton placeholder paints immediately and ends ManualNavigateToReports with is_warm: true.
• The heavy Search subtree mounts inside startTransition after the navigation transition completes, so the list does not compete with the navigation animation frame budget.
• Subsequent navigations to the same tab (react-freeze cache hit) re-use the already-mounted Search, do not show the skeleton, and end the span via the existing useFocusEffect — that path still measures to list visible.

Implementation:

• New src/components/Search/SearchWithNavigationDeferredMount.tsx. Accepts ComponentProps<typeof Search>, picks the placeholder container style from useResponsiveLayout() + props.hasFilterBars, and spreads props to Search.
• SearchPageWide and SearchPageNarrow (non-static branch) render SearchWithNavigationDeferredMount instead of Search directly. The static-rendering branch in SearchPageNarrow (post-submit overlay path) is left untouched.

Results:

Warm full - this is the time it takes for the first warm render to display the full list, rather than just the skeleton.

Fixed Issues

$ #91731
PROPOSAL:

Tests

1. Log in.
2. Cold start — In Troubleshoot, run "Reset Onyx", refresh the page, then navigate to the Reports page. Verify the page-level skeleton is shown until data arrives, then the list renders.
3. Warm start, first render — Go to Home, refresh the page, then navigate to the Reports page. Verify a skeleton briefly paints before the list appears.
4. Warm start, cached render — Go to Home, then back to the Reports page. Verify the list shows immediately without a skeleton.

• Verify that no errors appear in the JS console

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
• 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
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • 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)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
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  • Android: Native
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  • iOS: Native
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• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Screen.Recording.2026-05-27.at.16.46.29.mp4

iOS: Native

Screen.Recording.2026-05-27.at.16.42.14.mp4

MacOS: Chrome / Safari

Screen.Recording.2026-05-27.at.16.36.52.mp4

[codecov]

Codecov Report

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

Files with missing lines	Coverage Δ
src/pages/Search/SearchPageNarrow/index.tsx	73.33% <ø> (ø)
src/pages/Search/SearchPageWide.tsx	0.00% <ø> (ø)
...nents/Search/SearchWithNavigationDeferredMount.tsx	12.50% <12.50%> (ø)
... and 67 files with indirect coverage changes

[melvin-bot]

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[melvin-bot]

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