Stop the tag's spinner and the running step's pulse when motion is reduced

[HEOJUNFO]

Why

Two of Solid Glass's own components keep a looping animation when the reader has asked for reduced motion: the spinner in a Tag while progress is set (animate-spin), and a running row in ToolSteps (animate-pulse). The stylesheet already stops the other loops under prefers-reduced-motion (.animate-dot-flash, .status-shimmer, .progress-glow), and the site does the same with motion-reduce:animate-none (src/site/compare.tsx).

What changes

• tag.tsx: the progress spinner gets motion-reduce:animate-none.
• tool-steps.tsx: a running StepRow gets motion-reduce:animate-none with its animate-pulse.

With motion reduced, nothing is lost: the tag still fills and shows its percentage, and the row still says what it is running. Both are Solid Glass components (content/solid/), so the fix is in the component, not in src/solid-glass.css.

How it was checked

• npm run docs, npm run typecheck and npm run build pass.
• /dev/examples mounted 389 of 389 examples with 0 failed, in dark and light at 1440 × 1000, with reducedMotion set to both no-preference and reduce (Playwright).
• On the same pages I read animation-name of the tag spinner and the running step row:
  • no-preference: spin / pulse, before and after.
  • reduce: spin / pulse before, none / none after.
• I looked at tag-demo and tool-steps-list with motion reduced, in both themes.

Before review

• Every commit is signed off (git commit -s)
• npm run typecheck and npm run build pass
• /dev/examples reports 0 failed
• What the change touches was looked at in both themes

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