feat: F012 match detail view

Full decision analysis page at /demand/results/:matchId:
- MatchDetailHeader: score, badges, CTA (compare/shortlist), back button
- ExecutiveSummaryPanel: 4-row summary (fit, top reason, tradeoff, next step)
- PropertyOverviewPanel: key facts grid; signal-aware for FUTURE_AVAILABILITY
- NeedAlignmentPanel: comparison table with fit indicators (MATCH/PARTIAL/NO_MATCH)
- ScoreBreakdownPanel: hard/soft scores + modifiers + total (sidebar)
- TradeoffPanel: severity-coded list with mitigation hints
- RiskPanel: risks sorted CRITICAL→LOW with category chips
- MissingInformationPanel: priority-grouped with per-item CTAs
- SourceProvenancePanel: source type, label, URL, freshness
- FutureAvailabilityContextPanel: mandatory disclaimer + signal metadata
- NextActionsPanel: engine-ranked actions + standard actions (sidebar)
- Details button on result cards now navigates to match detail

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/match-detail/index.ts

@@ -0,0 +1,11 @@
+export { MatchDetailHeader } from './MatchDetailHeader'
+export { ExecutiveSummaryPanel } from './ExecutiveSummaryPanel'
+export { PropertyOverviewPanel } from './PropertyOverviewPanel'
+export { NeedAlignmentPanel } from './NeedAlignmentPanel'
+export { ScoreBreakdownPanel } from './ScoreBreakdownPanel'
+export { TradeoffPanel } from './TradeoffPanel'
+export { RiskPanel } from './RiskPanel'
+export { MissingInformationPanel } from './MissingInformationPanel'
+export { SourceProvenancePanel } from './SourceProvenancePanel'
+export { FutureAvailabilityContextPanel } from './FutureAvailabilityContextPanel'
+export { NextActionsPanel } from './NextActionsPanel'