Add PriceChart component tests for mount and series updates

[Benedict315]

Created comprehensive test suite for PriceChart.test.tsx with 20 passing tests covering:

Test Suites:

Mount and Unmount (4 tests): Verifies component mounts without canvas dependency failures, proper cleanup on unmount, ref clearing, and requestAnimationFrame cancellation
Series Updates (3 tests): Tests price data fetching on mount, empty data handling, and series creation with chart
Subscribe/Unsubscribe Behavior (4 tests): Validates socket price update subscriptions/unsubscriptions and window resize event listener management
Offline Badge Behavior (4 tests): Confirms LIVE/OFFLINE badge display and ConnectionStatus component visibility based on connection state
Error Handling (2 tests): Tests API error handling and loading state display
Chart Configuration (3 tests): Verifies chart creation with correct configuration, line series options, and custom height prop usage
Key Implementation:

Mocked lightweight-charts library to avoid real canvas dependencies
Mocked api-client, socket service, and useConnectionStatus hook
Implemented synchronous requestAnimationFrame mock for immediate execution
All cleanup assertions verify proper resource disposal on unmount
Acceptance Criteria Met:

✓ No real canvas dependency failures
✓ Cleanup on unmount asserted
✓ Subscribe/unsubscribe behavior tested
✓ Offline badge behavior tested
Closes #333

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