A Selection colors row could take a color style but not a color
variable, and a row linked to a style or variable could not be
unlinked from there.
selection.bindColorVariable binds a color variable to every solid fill
and stroke slot a row stands for. It replaces a color style on that
list and any earlier binding of the slot. A text range with fills of
its own takes the variable's value in the layer's modes. Gradients and
slots outside the variable's scopes are refused.
selection.detachColor unlinks the style or variable of a row's slots
and keeps their colors.
In the Design panel, the Styles menu of an unlinked row lists the
document's color variables after its color styles, and a linked row
shows a Detach button in the Styles button's place.
* Dev profile: line tables for workspace crates, no debug info for dependencies
* Tests: one integration-test binary per crate with several test files
* xtask ci: nextest, doctests, tests without examples, --keep-going; add xtask test
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