Extract shared Intl.Collator into CollatorUtils

[sosek108]

Explanation of Change

Prep slice 1 of 4 decomposing #99062 (Route Search previews through the shared LHN alternate text pipeline). This slice only extracts the shared Intl.Collator construction into a new CollatorUtils.getCollator(locale) helper, ahead of the actual pipeline change.

Behavioral note: in LocaleContextProvider, this replaces a per-render new Intl.Collator(...) with a shared cached instance. Intl.Collator#compare is stateless, so sharing the instance across renders/locales is safe, and the now-stable identity helps downstream memoization.

No behavior change otherwise — all three call sites keep the same COLLATOR_OPTIONS, just sourced from one place.

Fixed Issues

$ #98958
PROPOSAL:

Tests

1. Change the app locale (Settings > Preferences > Language) and confirm LHN / report list sorting still respects locale-aware collation as before.
2. Use Search / SearchRouter and confirm result sorting is unchanged.

Offline tests

N/A — pure refactor of locale-aware string comparison, no network interaction.

QA Steps

Same as tests.

• Verify that no errors appear in the JS console

PR Author Checklist

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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[sosek108]

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Reviewed commit: 5b721e7c8d

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