fix(web): align search icon style with other header icons

[ruiqiyang123]

Summary

The search icon in the web dapp header was visually inconsistent with the other header icons (notification, menu, language, theme).

Root cause: UniversalSearchInput used a plain IconButton directly, while all other header icons use the shared HeaderIconButton wrapper which provides:

• focusVisibleStyle={undefined} — removes the default focus outline, matching the other icons
• tooltipProps={{ placement: 'bottom' }} — consistent tooltip positioning

Additionally, the icon was missing the size="small" prop, causing it to render at the default medium size ($6 icon / $1.5 padding) instead of small ($5 icon / $1 padding) like its siblings.

Changes

• Replace IconButton with HeaderIconButton to match the shared header icon pattern
• Pass size="small" to align icon and padding dimensions with other header icons
• Replace hardcoded English title="Search everything" with intl.formatMessage using the existing ETranslations.global_search_everything key

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[revan-zhang]

✅ Snyk checks have passed. No issues have been found so far.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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