Allow `outline_color` to accept an obs column#683

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feat/issue-681-outline-color-by-column

Commits on May 21, 2026

Allow `outline_color` to accept an obs column (#681)
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Address review fixes for outline-color-by-column (#681)
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Simplify outline-by-column implementation (#681)
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Address second-pass review feedback (#681)
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Reduce outline-color test count to the user-visible behavior set (#681)
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Second simplify pass: dedup helpers + latent join bug (#681)
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Replace outline-color smoke tests with visual reference-image tests (#681)
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Fix outline-vector alignment when only outline has a table (#681)
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Fix datashader outline column-attach using positional assignment (#681)
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Add reference images for outline-color-by-column visual tests (#681)
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User-controllable legend titles for fill/outline (#681)
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Refresh outline-color reference images for new title behavior (#681)
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Stack fill+outline legends from the top of the right margin (#681)
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Refresh fill+outline both-columns reference for new legend stacking (#681)
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