A native <input type="color"> always holds a value, so the form always
sent the input's default colour and a tag could never be colourless. Add
a "Color" checkbox gating the swatch: off by default on the new-tag form
(so tags are colourless unless opted in) and initialised from the tag on
the edit form, which can now clear a colour. Sends color: null when off.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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