82307: debounce autocomplete query and memoize search options

[abbasifaizan70]

Explanation of Change

The SearchRouter was passing autocompleteQueryValue (updated via useState on every keystroke) directly to SearchAutocompleteList, triggering synchronous getSearchOptions() + combineOrderingOfReportsAndPersonalDetails() + isSearchStringMatch() on every character typed, freezing the JS thread on mobile.

Structural optimizations (debouncing + memoization prevent redundant work):

• useDebouncedState for autocompleteQueryValue: Replaces useState so the expensive SearchAutocompleteList filtering only runs after the user pauses typing, not on every keystroke. The immediate value still drives arrow-key navigation and contextual logic.
• useMemo for searchOptions: Wraps getSearchOptions() so it only re-runs when its 13 dependencies actually change, instead of re-computing on every render.
• useMemo for recentReportsOptions: Wraps combineOrderingOfReportsAndPersonalDetails() so sorting/filtering is skipped when autocompleteQueryValue and searchOptions haven't changed.

Algorithmic improvement:

• isSearchStringMatch: new RegExp() per word per item → compile once per call, reuse across all items
• isSearchStringMatch: matching flag with continue past failures → early return false on first mismatch
• searchWords: new Set() keeping empty strings → Array.from(new Set(...)).filter(Boolean)

Performance (Reassure, 40K reports):

Metric	main (baseline)	PR (current)	Change
getFilteredOptions with search	2.8 ms	2.5 ms	-0.3 ms (-11.7%)
filterAndOrderOptions (40K items, 3-word query)	11.1 ms	10.4 ms	-0.7 ms (-6.4%)

Fixed Issues

$ #83207
PROPOSAL: #83207 (comment)

Tests

1. Open the app on a mobile device (iOS or Android) and tap the search icon in Inbox
2. Type rapidly into the search input (e.g. "Email Report Five") — verify the input stays responsive with no visible lag or dropped characters
3. Stop typing and wait briefly — verify search results update and reflect the typed query
4. Clear the search input — verify recent chats reappear immediately
5. Type a partial query (e.g. "Exp") — verify autocomplete suggestions appear after a short delay
6. Select an autocomplete suggestion — verify the query updates correctly and results reflect the selection
7. Use arrow keys (desktop) or scroll (mobile) to navigate through the results list while typing — verify navigation remains responsive
8. Type a multi-word query (e.g. "John Expense Report") — verify all matching results are returned correctly
9. Open search on a device/account with many reports and contacts — verify no JS thread freeze or unresponsiveness during typing
10. Press the back button or swipe to dismiss search while typing — verify navigation is not blocked

• 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
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
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  • 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.
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Screenshots/Videos

Android: Native

Screen.Recording.2026-04-02.at.4.04.17.AM.mov

Android: mWeb Chrome

Screen.Recording.2026-04-02.at.4.05.33.AM.mov

iOS: Native

Screen.Recording.2026-04-02.at.3.57.50.AM.mov

iOS: mWeb Safari

Screen.Recording.2026-04-02.at.3.58.48.AM.mov

MacOS: Chrome / Safari

Screen.Recording.2026-04-02.at.3.56.08.AM.mov

[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/components/Search/SearchAutocompleteList.tsx	78.26% <100.00%> (-10.53%)	⬇️
...rc/components/Search/SearchRouter/SearchRouter.tsx	30.32% <100.00%> (-10.67%)	⬇️
src/libs/OptionsListUtils/index.ts	83.27% <0.00%> (+0.12%)	⬆️
... and 11 files with indirect coverage changes

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[trjExpensify]

PR doesn’t need product input as a performance PR. Unassigning and unsubscribing myself.