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feat(toc-panel): add virtual scrolling for large TOC lists#19
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- Implement virtual scrolling for TOC panels with >50 items - Only render visible items plus buffer for better performance - Use absolute positioning and a spacer element for scroll height - Flatten nested items for virtual scroll rendering - Preserve level-based indentation via CSS classes - Add ResizeObserver for dynamic container height updates - Add comprehensive tests for virtual scrolling behavior
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Summary
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src/components/ui/toc-panel.ts: Added virtual scrolling logic with configurable threshold (50 items)src/components/ui/toc-panel.test.ts: Added 18 tests covering virtual scrolling, events, accessibilityTest plan