gbanyan a77cd17419 Fix TOC button to be truly fixed-position using React Portal ...

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>

2025-11-20 22:42:59 +08:00

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