fix(skills): batch animation-map sampling

[miguel-heygen]

What

Batch each tween's animation-map seek and bbox samples into one browser evaluation instead of doing a CDP round trip plus a 100ms wall-clock sleep for every sample.

Why

A 60-second, 19-scene single-file composition timed out in the hyperframes-animation animation-map helper after both 120s and 300s, while hyperframes check and render completed successfully. The helper's runtime scaled with tweens × samples × 100ms even though HyperFrames/GSAP seeks update DOM state synchronously.

Reproduction

A generated 60-second fixture with 600 GSAP tweens and six samples per tween exceeded a 35-second timeout before this change. With batching, the same fixture completed in 4.6 seconds and emitted all 600 mapped tweens.

The reproduction initially also exposed the existing rational-FPS capture-session issue addressed separately by #2329; this PR deliberately does not duplicate that fix.

Tests

• Added a regression test proving all requested seek samples and bbox/style measurements happen in one browser evaluation.
• node --test skills/hyperframes-animation/scripts/animation-map-sampling.test.mjs
• bun run test:skills — 230 passed
• bun run lint:skills
• Targeted oxlint and oxfmt checks
• git diff --check