Redesign home page with new layout and component system
- Two-column layout (My Leagues 2/3, Upcoming Events 1/3) with mobile stack
- LeagueRow: square avatar, gradient draft highlight, rank/points display, progress bar
- MyLeaguesCard, CreateLeagueCard with shared SectionCardHeader
- UpcomingEventsCard: vertical timeline with grouped multi-league events
- Shared gradient system: BracktGradients SVG defs, GradientIcon wrapper, brand.ts constants
- Button default variant updated to green→cyan gradient
- Navbar: plain nav links with gradient hover, support/admin icon buttons
- Accessibility fixes: semantic h2 headings, aria-label on LeagueAvatar and nav elements
- Storybook stories for all new components
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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