Moves the tracing toggle and its opacity slider off the palette bar. The bar is
what you set before you draw — the tone and the tool — and whether a reference
photo is showing is not that; it is a viewing aid, like solo, and it belongs
with the other things the inspector says about what is on the stage.
Its own `footage` section rather than part of `tracing · <face>`, which is the
whole reason it could come back to the inspector at all. That section needs a
face to be about, so it is absent when a take is open and nothing is selected —
the commonest case there is — and a switch that appears only once the right row
has been found makes the way to see the footage you are tracing depend on what
you clicked, which is what put the thing on the bar in the first place. So the
section keys off `trace/traceable-faces` of the OPEN symbol: present whenever
the picture has any footage behind it, wherever the selection happens to be.
No change to the state or the events. `[:ui :trace]` is still a set of faces and
one opacity, `::trace-faces` still switches every face the open symbol has on
unless they all already are, and a face's own timeline row still singles it out.
The label loses the word "footage" because the section heading now says it.
`.trace-opacity` was 64px to survive a crowded flex bar and is `flex: 1` on a
pane row instead; `.palette-bar label.dim` had no remaining user.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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