Resolves sure-design DS drift patrol findings (raw <details> on
goals/_color_picker and categories/_form). The color-icon-picker's
<summary> is a 24/28px pencil button absolutely positioned next to
the avatar — none of DS::Disclosure's existing variants
(default / card / card_inset / inline) match that trigger shape, so
the bot's suggested swap would regress the visual.
- DS::Disclosure: add optional `summary_class:` kwarg. When set, the
caller's class string replaces the variant's hard-coded summary
chrome; otherwise the existing variant logic is preserved (verified
against the 8 existing callsites — none pass summary_class, all
fall through to current behavior).
- goals/_color_picker + categories/_form: swap raw <details> for
DS::Disclosure with summary_class carrying the pencil-button
positioning. Stimulus data attributes (`color-icon-picker-target`
and the outside-click handler) forwarded via **opts to tag.details
so the controller still finds its target.
The DS::Disclosure-rendered popover content now sits inside the
component's `<div class="mt-2">` wrapper, but the popups themselves
are `position: absolute` / `position: fixed`, so the wrapper is
out-of-flow neutral.
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