perf: defer personal details weighting in SuggestionMention

[TMisiukiewicz]

Explanation of Change

On accounts with a large number of personal details (~17k), opening a report (especially invoice reports) spent significant time inside SuggestionMention computing weightedPersonalDetails via a useMemo. That memo ran on every render and spread-copied all personal details ({...detail, weight}) even when the user was not typing a mention.

This PR defers the weighting until a mention is actually being resolved:

• Removed precomputing weightedPersonalDetails at render time
• Moved both getPersonalDetailsWeight and the weighted-details computation inline inside getUserMentionOptions, which only runs inside the debounced calculateMentionSuggestion when prefixType === '@' and isMentionCode passes.
• getUserMentionOptions now takes only searchValue instead of a pre-built weighted map.

No UI change. Same inputs → same outputs. The O(17k) allocation cost shifts off the render path onto the already-debounced keystroke path, so for large accounts the render-time cost of this computation drops to 0.

On account with 17k personal details, average time of ManualOpenReport on opening the invoice drops from 2.16s to 1.87s (~13% improvement)

Fixed Issues

$ #88334
PROPOSAL:

Tests

1. Open a report on an account with many contacts
2. Type a message without @ — verify the composer behaves normally (i.e. no mention suggestions pop up)
3. Type @ - verify suggestions show up
4. Type @ + a few chars — verify suggestions appear correctly and match prior ordering.
5. Create an invoice
6. On an invoice report, open and confirm no slowdown on initial render.
7. Verify mention suggestions still respect report membership and policy context.

• Verify that no errors appear in the JS console

Offline tests

N/A

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:
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  • Android: mWeb Chrome
  • iOS: Native
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  • MacOS: Chrome / Safari
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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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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[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
...x/report/ReportActionCompose/SuggestionMention.tsx	76.23% <100.00%> (-0.84%)	⬇️
... and 17 files with indirect coverage changes

[melvin-bot]

@abzokhattab 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]

[chatgpt-codex-connector]

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[MelvinBot]

🤖 PR Review

Logic bug in the weighting condition — the refactor changes behavior, not just timing.

Old code (removed useMemo):

if (!isGroupChat(currentReport) && !doesReportBelongToWorkspace(currentReport, ...)) {
    return personalDetails; // skip weighting
}
// weighting applied when: isGroupChat || doesReportBelongToWorkspace  (De Morgan's)

New code:

const shouldWeightDetails = isGroupChat(currentReport) && doesReportBelongToWorkspace(currentReport, ...);

The old code weights when either condition is true (||). The new code weights only when both are true (&&). This means reports that are group chats but not in a workspace (or non-group workspace reports) will lose their mention weighting, changing suggestion order.

Fix: change && to || on the new line:

const shouldWeightDetails = isGroupChat(currentReport) || doesReportBelongToWorkspace(currentReport, policyEmployeeAccountIDs, policyID, conciergeReportID);

Everything else looks good — dependency array is complete, the single call site is updated, imports are correct, and the perf win (deferring O(n) allocation off the render path) is real and well-motivated.

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Reviewed commit: c75655f460

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[abzokhattab]

Let's add a few unit tests to cover the shouldWeightDetails branches in SuggestionMentionTest and increase the code coverage

[abzokhattab]

Type a message without @ - verify suggestions show up

i think this step in the PR description was overlooked i think you mean Type a message without @ — verify the composer behaves normally (i.e. no mention suggestions pop up)

[abzokhattab]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
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  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
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  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
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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.
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Screenshots/Videos

Android: HybridApp

Screen.Recording.2026-04-21.at.01.37.57.mov

Android: mWeb Chrome

Screen.Recording.2026-04-21.at.01.41.15.mov

iOS: HybridApp

Screen.Recording.2026-04-21.at.01.37.57.mov

iOS: mWeb Safari

Screen.Recording.2026-04-21.at.01.41.15.mov

MacOS: Chrome / Safari

Screen.Recording.2026-04-21.at.01.36.32.mov

[TMisiukiewicz]

@abzokhattab updated, thanks!

[abzokhattab]

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[MelvinBot]

I reviewed the changes in this PR. This is a purely internal performance optimization that defers personal details weighting in SuggestionMention from render time to the debounced mention-resolution path. There are no UI changes, no new features, no renamed labels/settings, and no changed user-facing behavior.

No help site changes are required.