Add --graph-report CLI flag for modern API coverage tree visualization with enhanced UX#10

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Copilot wants to merge 6 commits intomainfrom

copilot/fix-88b949f6-b8a0-4dcc-9129-66d1472cadee

Commits on Sep 21, 2025

Initial plan
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Initial plan for adding --graph-report feature

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Add --graph-report CLI flag with D3.js graph visualization

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Complete implementation of --graph-report feature with comprehensive testing

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Improve graph schema to expandable tree structure with hierarchical organization

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Improve readability and UX with modern CSS-only tree visualization

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