The TOC toggle button was appearing near the end of posts instead of
floating at a fixed position. This happened because the button was
rendered inside the PostLayout component hierarchy.
Changes:
- Use React Portal to render TOC button at document.body level
- Add mounted state for proper SSR/client hydration
- Button now floats like back-to-top button, visible from start
This ensures the button is always visible and accessible, similar to
the back-to-top button behavior.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Problem: Table of Contents displayed headings from previously viewed
articles when navigating between posts via client-side routing.
Root cause: PostToc component's useEffect with empty dependency array
only ran once on mount, so it retained stale heading data when React
reused the component instance during navigation.
Solution: Add contentKey prop flow:
- Blog/page routes pass slug to PostLayout
- PostLayout passes contentKey as key prop to PostToc instances
- React remounts PostToc when key changes, rebuilding TOC correctly
Files changed:
- components/post-layout.tsx: Add contentKey prop and key forwarding
- app/blog/[slug]/page.tsx: Pass slug as contentKey
- app/pages/[slug]/page.tsx: Pass slug as contentKey
