feat: sequences and playlists that know which rig they are for

[pyramation]

Summary

Sequences and playlists were built for the 7×7: hardcoded animation/scene lists and three presets whose steps (heart-breathe, i-heart-sf) mean nothing on a ring. Both surfaces now come from a shared registry, and each look declares what it needs rather than carrying a geometry hash — a hash answers "which rig is this?", which is the question the layout ID already answers, and it can't say the heart is meaningless on a ring.

type Fits =
  | { needs: 'any' }                              // rainbows, sweeps, breathe
  | { needs: 'grid'; cols: number; rows: number }  // heart, I♥SF
  | { needs: 'ring' }                              // Nova amber motion
  | { needs: 'layout'; ids: string[] };            // a named installation

fitsReason(fits, layout): string   // '' when it fits, else 'needs a grid' / 'needs 7×7 or larger'

Nothing is hidden: looksForLayout(layout) and showPresetsForLayout(layout, kind) return everything, fitting entries first, each carrying a reason the UI shows and dims by. An operator can still run a mismatched preset — they know more about the room than the layout does.

Filter chips (All / 7×7 / Grace / Nova) pick the rig presets are judged against, using the real generators (presets['grid-7x7'](), presets['grace-cathedral'](), presets.nova()) so there's no second description of a rig to drift. All judges against the layout actually running, from /api/config — which is what removes the baked-in 7×7 assumption.

Pre-populated in SHOW_PRESETS: generic shows (solid vibes, pride, ambient, high energy), 7×7 (heart night, SF showcase), Nova amber (amber hour, slow burn, circle, house lights, chase), and Grace (vigil, rose, playlist) — as both sequences and playlists.

Two fixes fell out of building it:

• trans-flow / trans-breathe / trans-ring were referenced by existing sequence definitions but never registered, so those steps were silently dead. Implemented, and a test now asserts every preset step resolves to a real animation or scene, plus that the catalog and the registries never drift apart.
• Audio defaults to energy + replace (was plasma + brighten), and the range slider track starts at #4a4a63 instead of near-background #1a1a2a so the travel is visible.

Link to Devin session: https://app.devin.ai/sessions/ec43152136134467a853ec0bbf783ea9
Requested by: @pyramation

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