feat: ApiCard context menu (#253)

[whitezaddy]

Closes #253

Description

This PR resolves #253 by extending the ApiCard component with an accessible, responsive right-click and touch-emulated long-press custom context action menu.

Core Changes

• Accessible Menu Layout: Created src/components/ContextMenu.tsx adhering to WCAG 2.1 AA benchmarks, featuring full keyboard navigation traps (Escape handler dismiss) and screen-reader role="menu" attributes.
• Breakpoint Controls: Implemented desktop cursor mapping via onContextMenu alongside mobile touchscreen emulation timers tracking onTouchStart/onTouchEnd bounds.
• Token Consistency: Styled containers natively using existing semantic background design tokens ensuring effortless adaptation across light and dark system color modes.

Type of change

• Bug fix
• New feature
• Documentation update
• Other

Checklist

• I have read the contributing guidelines
• I have tested my changes locally (verified focused menu element tests pass)
• My code follows the project's coding standards

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