fix: harden responsive layout for narrow viewports

[tbjers]

Address overflow, clipping, and navigation issues that appeared below ~768px, down through 344px, reported iteratively from device-width screenshots.

Docs content

• Wrap deftables in a horizontally-scrollable container; Command-column code now word-wraps (extending the scrollable table) instead of breaking mid-word.
• New remark-inline-code-breaks plugin injects <wbr> after each slash in inline-code paths, so long paths break on separators (not mid-token) without double-escaping shell metacharacters. Site-only — the downstream docs export does not run remark plugins, so generated markdown is unaffected.
• Prose inline code uses overflow-wrap: break-word (so <wbr> slash hints win); table code uses overflow-wrap: normal.
• Hanging indent on ordered lists so wrapped content aligns under the first line.
• Fix the docs header losing horizontal padding at 768px (a shorthand padding had zeroed it).
• Callout wraps children in a <div> to avoid invalid <p>-in-<p> nesting (SSR warning).

Navigation

• Add a burger menu (full-screen overlay, rendered as a body-level sibling) for the nav links when the inline links collapse at ≤760px.
• Hide the brand label and shorten the theme picker to color dots on the narrowest screens; switch the GitHub link to the Octocat icon.
• Center the controls in a three-zone grid at ≤760px.
• Theme-picker menu becomes a full-screen overlay on small screens, sized with viewport units so .topbar's backdrop-filter containing block doesn't collapse the fixed overlay.

Hero

• Fix a grid blowout that clipped the CTA buttons and the "Works with" strip: minmax(0, …) tracks, min-width: 0 on the meta column, and overflow-wrap on the repo slug so it wraps instead of forcing the layout wider than the viewport.

Verification

• pnpm check — 0 errors / 0 warnings
• pnpm build — clean
• pnpm test — 41 passing (added coverage for table wrapping incl. hand-written HTML + double-wrap guard, <wbr> injection, and the double-escape guard)
• Confirmed visually at narrow viewports (344px–768px)

🤖 Generated with Claude Code

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