Fix contradictory ToC card width caps

[myelinated-wackerow]

Summary

The card variant of TableOfContents set min-w-80 and max-w-72 on the same element, a 320px floor above a 288px ceiling — min wins in CSS, so the max was dead and the card always rendered at 320px. Both are replaced with w-80 on root, where the file's own comment says width caps belong. Rendered width is unchanged at 320px, verified at 1000/1200/1536px.

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[github-actions]

🔎 First-pass review — ✅ Looks mergeable

One-line CSS correctness fix on TableOfContents. The card variant carried min-w-80 max-w-72 on the container slot — a 320px floor above a 288px ceiling, so min-width won and max-w-72 was dead code; the card always rendered at 320px. The fix removes both and moves w-80 onto root, which matches the slot's own width-caps note (line 18) and the docs variant that also puts width caps on root. Rendered width stays 320px (container fills the now-w-80 root), consistent with the multi-breakpoint verification in the description.

Analysis

• Lane: code (src/components/TableOfContents/index.tsx)
• Checked: the removed/added Tailwind classes against the CSS min/max precedence claim, placement against the existing root width-caps comment, and consistency with the docs variant. tv (not cva), no unused vars, no raw Intl.*, no chain names — all clean.
• Non-blocking: none. CI may still be running.

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