Rename History.tsx to HistoryAndNotifications.tsx for consistency
with component name and update imports.
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Co-Authored-By: Claude <noreply@anthropic.com>
Tests cover basic rendering, numbering, expansion functionality, and
expansion state persistence when new items are added. Includes
regression test for notification expansion state tracking bug.
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Co-Authored-By: Claude <noreply@anthropic.com>