Hide the page scrollbar on touch screens

[ryanbarlow97]

Phones no longer show a scrollbar down the side of the page.

What changes

• The themed ::-webkit-scrollbar rules (and the Firefox scrollbar-width/scrollbar-color fallback) in globals.css now sit inside @media (hover: hover) and (pointer: fine), so only mouse and trackpad devices get them. Desktop looks the same.
• On (pointer: coarse) the page itself has no scrollbar (html { scrollbar-width: none } plus html::-webkit-scrollbar { display: none }).
• Inner scrollers on touch screens drop the 8px themed track and use the browser's own fading bar.

Testing

• Headless Chromium with scrollbars on (Playwright, --hide-scrollbars removed), old vs new CSS on a long page with an inner scroller:
  • Desktop 1280×800: themed 8px page and inner bars, unchanged.
  • Pixel 7 emulation: old draws a grey bar at the page's right edge after scrolling and an 8px inner track; new draws neither.
  • iPhone 14 emulation (Chromium): old 8px inner track, new none.
• Not checked on a real iPhone; Safari on iOS draws its own indicators and may ignore these rules.
• npx oxfmt --check app/internal/globals.css passes.

Follow-up to #185.

🤖 Generated with Claude Code

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