Summary

• Moves the # anchor link from before heading text to after it
• Hidden by default, fades in and slides right on heading hover (200ms ease-out)
• Updates plugin TOC regex to strip trailing # instead of leading
• Adds feature tests for HeadingRenderer behavior

Test plan

• Feature tests pass for heading anchor placement, classes, IDs, and level filtering
• Visually verify # appears after heading text on hover on docs, plugin, and article pages
• Verify plugin table of contents still populates correctly

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