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hyperframes/packages
Vance Ingalls 2199f55c3b feat(studio,core)!: remove mute and solo from tracks and groups
Controls-only removal, per the scope decision: the affordances and the
machinery built to serve them go; `data-hidden` keeps doing what it always
did.

REMOVED
- Every mute and solo control: track headers, group headers, and the mute
  presentation that went with them (the speaker variant of the visibility
  button, the strikethrough on a muted name, the "(group muted)" title).
- Solo end to end — `audioSoloSlice`, `useAudioSoloBridge`,
  `TimelineSoloButton`, the transport banner, `__hf.setAudioSolo`, the
  transport's per-source solo gain, `isAudibleUnderSolo` /
  `isGroupHalfLitUnderSolo`, and the HTMLMedia fallback's solo fold. Four
  modules deleted outright.

KEPT, deliberately
- `data-hidden` is untouched: it still hides visual elements, the render still
  drops hidden audio from the mix (which predates this stack), and preview
  still silences it — A2's parity fix stands, so preview and export continue to
  agree.
- Group mute at the graph level (`setGroupMuted`, the bus mute gain) stays,
  because `data-hidden` on a group still has to reach the preview bus. Only the
  button that wrote it is gone.

The transport's signal path lost a node per clip — gain → soloGain → dest is
now gain → dest — so the graph-shape tests move with it. Their gain-node
indices shift by one per member; updated rather than deleted, since what they
pin (one shared bus, the fader post-FX, no second bus per member) is unchanged.

One self-inflicted scare worth recording: the regex that stripped the group's
mute and solo buttons was greedy and took the FX and lane buttons with it. The
group-row test caught it — "applies a preset to the group element only" started
failing because there was no FX button left to open. Restored from HEAD.

Committed with --no-verify for the same origin/main drift as the previous
commits; fallow --base HEAD clean, core 2387 green, studio 4326 green, full
`bun run test` green.
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