Decompose Search highlight subscriptions into SearchNewItemDetector wrapper

[adhorodyski]

Explanation of Change

COLLECTION.TRANSACTION and COLLECTION.REPORT_ACTIONS Onyx subscriptions were living directly inside Search/index.tsx. Any time any transaction or report action changed anywhere in the app, the entire Search component re-rendered — including its expensive sortedData memo and all downstream children.

This change moves those two subscriptions into a new lightweight wrapper component, SearchNewItemDetector, which sits just above SearchList in the tree. Because SearchNewItemDetector receives children from Search's scope (referentially stable), React skips re-rendering SearchList and its subtree when the collections fire. A new SearchHighlightContext carries the highlight/scroll data down to SearchList via context, replacing the old prop-drilling.

Additional cleanup included in this PR:

• newTransactions derivation now diffs search-result snapshots instead of the live COLLECTION.TRANSACTION collection, avoiding extra renders in Search. The fields read (comment.originalTransactionID, split metadata) are structural/immutable, so the staleness risk is negligible.
• Highlight computation (shouldAnimateInHighlight) moved from Search's sortedData memo into SearchList's own highlightedData memo, so it only runs when SearchList re-renders.
• 4 effects had their eslint-disable react-hooks/exhaustive-deps directives removed after their dependency arrays were corrected.
• Toggle callbacks now read from the searchResults.data snapshot instead of the live transactions collection.

Fixed Issues

$
PROPOSAL:

Tests

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

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[codecov]

Codecov Report

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

Files with missing lines	Coverage Δ
src/components/Search/SearchList/index.tsx	46.95% <100.00%> (+46.95%)	⬆️
src/hooks/useSearchHighlightAndScroll.ts	85.71% <100.00%> (ø)
src/components/Search/SearchHighlightContext.tsx	66.66% <66.66%> (ø)
src/components/Search/SearchNewItemDetector.tsx	33.33% <33.33%> (ø)
src/components/Search/index.tsx	35.08% <6.25%> (+35.08%)	⬆️
... and 323 files with indirect coverage changes