fix: tighten hybrid-device touch guards and pin Node version in CI

[Copilot]

The previous touch guards used (pointer: coarse) which only checks the primary pointer — on hybrid devices (iPad + trackpad, convertibles) the primary pointer can be fine even when touch is present, letting scroll jank reappear.

Changes

• reactive-glow.js — replace (pointer: coarse) with (any-pointer: coarse) || navigator.maxTouchPoints > 0 so the scroll pulse is skipped on any touch-capable device regardless of primary pointer type:

  const hasAnyCoarsePointer =
    typeof window.matchMedia === 'function' &&
    window.matchMedia('(any-pointer: coarse)').matches;
  const hasTouchPoints =
    typeof navigator !== 'undefined' &&
    typeof navigator.maxTouchPoints === 'number' &&
    navigator.maxTouchPoints > 0;
  const isTouchDevice = hasAnyCoarsePointer || hasTouchPoints;

• globals.css — tighten scroll media query from (pointer: fine) to (pointer: fine) and (not (any-pointer: coarse)), preventing desktop smooth-scroll / overscroll containment from applying on hybrid devices that expose a fine primary pointer alongside touch:

  @media (pointer: fine) and (not (any-pointer: coarse)) { … }

• deploy.yml — pin Lighthouse CI job's node-version from the floating '20' to '20.19.0', matching the guard job and satisfying engine-strict=true.

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[Copilot]

Pull request overview

Improves hybrid-device behavior by preventing scroll-related visual effects and smooth-scroll CSS from activating when touch input is available (even if the primary pointer is fine), and aligns CI Node.js versioning with the repo’s engine constraints.

Changes:

• Update touch detection in reactive-glow.js to treat devices as touch-capable when any coarse pointer is present or when navigator.maxTouchPoints > 0.
• Restrict “desktop-only” scroll CSS to pointer: fine devices that do not expose any coarse pointer.
• Pin the Lighthouse CI job Node.js version to 20.19.0 to match engine-strict/engines.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
public/js/reactive-glow.js	Uses any-pointer: coarse and maxTouchPoints to avoid scroll-pulse jank on hybrid/touch-capable devices.
app/globals.css	Prevents desktop smooth-scroll/overscroll containment from applying on hybrid devices with touch.
.github/workflows/deploy.yml	Pins Lighthouse job Node.js to 20.19.0, matching the guard job and repo engines.

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