feat(creator-detail): add responsive bonding curve price history chart

[Francis6-git]

Summary

Adds a responsive line chart to the creator key detail page to visualize historical bonding curve prices across selectable timeframes (1H, 24H, 7D).

Changes Made

• API & Data Layer: Added PriceHistoryInterval and PriceHistoryPoint types and implemented courseService.getPriceHistory pointing to GET /keys/:keyId/price-history.
• React Query Integration: Added usePriceHistory hook with interval-keyed query caching (['creators', creatorId, 'priceHistory', interval]).
• UI Components:
  • Created PriceHistoryChart using Recharts (ResponsiveContainer, LineChart, XAxis, YAxis, Tooltip).
  • Added timeframe toggle buttons (1H, 24H, 7D) with accessible active states (aria-pressed).
  • Integrated skeleton loader (data-testid="price-history-skeleton") to prevent cumulative layout shift during fetches.
  • Implemented an empty state view ("No price history yet").
• Page Integration: Mounted <PriceHistoryChart /> on CreatorDetailPage directly below the profile header.

Acceptance Criteria Verification

• Chart renders correct data points for each selected interval.
• Switching intervals re-fetches and re-renders data cleanly.
• Loading skeleton displays during data fetch.
• Empty state renders when the price series is empty.
• Layout is responsive across mobile and desktop breakpoints.

Testing & Validation

• Executed pnpm build successfully.
• Executed pnpm lint with zero errors.
• Unit tests added to PriceHistoryChart.test.tsx (all passing).
• Integration tests updated in CreatorDetailPage test suite (all passing).

Closes #778

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