feat: market timeline tab

[OG-wura]

Close #450

Summary

Adds a "Timeline" tab to the Market Detail page showing a vertical timeline of market lifecycle events (creation, opening, predictions, odds changes, disputes, resolution, payouts).

Changes

New Files

File	Description
types/market-timeline.ts	Type definitions for market events (MarketEvent, MarketEventType, MARKET_EVENT_CONFIG) with 10 event types, icons, and color mappings
lib/market-timeline.ts	Mock data generator (14 realistic events), relative time formatting, date-based grouping utility
components/market/MarketTimeline.tsx	Vertical timeline component with: colored event dots with icons, date-grouped sections, collapse/expand for groups with 4+ events, loading/empty/error states, "Load Older Events" pagination
components/market/__tests__/MarketTimeline.test.tsx	19 tests covering rendering, event display, date grouping, collapse/expand, load more, edge cases

Modified Files

File	Description
components/market/MarketDetailTabs.tsx	Added "timeline" to TAB_VALUES, added timeline prop, rendered Timeline tab trigger and content
components/market/__tests__/market-detail-tabs.test.tsx	Updated to pass timeline prop; added 4 tests for timeline tab switching, deep-linking, and default value
app/(dashboard)/events/event-page/EventDetailsClient.tsx	Imported MarketTimeline and passed it as the timeline prop
types/index.ts	Re-exported market timeline types

Design Decisions

• Standalone component: MarketTimeline accepts optional events prop and falls back to mock data — easy to swap in real data later
• Date grouping: Events grouped by Today/Yesterday/This Week/This Month with automatic collapse at 4+ events
• Design tokens: Uses text-muted-foreground, bg-card, text-foreground, bg-muted etc. for dark-mode compatibility
• WCAG: Semantic <time> elements with ISO dateTime, aria-label on collapse buttons, proper heading hierarchy
• Inline SVGs: Event type icons are inline SVG elements (not emoji) for consistent rendering across platforms
• Amount display: Financial events show colored badges (green for payouts, blue for liquidity, muted for others)

Testing

PASS components/market/__tests__/MarketTimeline.test.tsx (19 tests)
PASS components/market/__tests__/market-detail-tabs.test.tsx (9 tests, +4 new)

• All 28 tests passing
• No lint errors in new/modified files
• No type-check errors in new/modified files

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[greatest0fallt1me]

LGTM — solid tests too. Merged 🌟