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feat(speed): switch Playback Speed to 0x–4x forward (drop reverse)

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Real-browser eyeball: below-0x reverse jittered because the base loop
clips aren't all-intra (the flagged risk). Narrow the slider to 0x–4x
forward (still continuous, step=any); 0x still freezes; OS reduced-motion
behavior unchanged. Removes the manual rAF reverse loop and the
HEFScrub.reverseStep helper + its unit tests.

Tests: node unit 10/10; a11y e2e 12/12 (Task 5 now 3 slider tests).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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BenStullsBets
2026-06-30 12:48:14 -07:00
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docs/superpowers/specs/2026-06-30-playback-speed-slider-design.md
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# Playback Speed slider (replaces "Reduce motion") — design
**Date:** 2026-06-30
**Status:** Approved (pending written-spec review)
**Status:** Shipped, then revised
**Scope:** Frontend only (`simulator/static/`). No engine, pipeline, or media changes.
> **Revision (2026-06-30, post-eyeball):** Reverse playback was **dropped**. In a
> real browser the below-0× reverse loop jittered — the base loop clips aren't
> all-intra, so backward seeking can't stay smooth (exactly the risk flagged
> below). The slider is now **0×–4× forward** (still continuous, `step="any"`).
> `0×` still freezes; OS reduced-motion behavior is unchanged. The
> `HEFScrub.reverseStep` helper and its tests were removed. Sections below
> describing the −2…2 range and the manual reverse loop are superseded by this
> note.
## Summary
Add a continuous **Playback Speed** slider (−2× … 2×) that controls the resting