Replace solid white event cards with glass-effect cards featuring
backdrop blur, semi-transparent gradient backgrounds, and light
borders that blend with the Electric Dusk gradient background.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Group events into five temporal sections with section headers, date subheaders,
and context-aware time display (clock time for upcoming, relative for past).
Includes new useEventGrouping composable, SectionHeader and DateSubheader
components, full unit and E2E test coverage.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
