Add the browser Settings surface as slot-composed plugins over new
preference services:
- Rename dsh-client-i18n to dsh-client-locale (locale is the domain
name); LocaleService adds getLocale()/setLocale(id), immutable
snapshots, a locale/change event, and dsh.locale persistence.
- ThemeService owns the light/dark/system preference (default system),
resolves system via prefers-color-scheme, publishes theme/change
snapshots, persists dsh.theme, and no longer touches the DOM;
ui-layout's ThemePresenter applies resolved snapshots
(body[data-ds-dark-theme] + alias tokens) and cleans up on dispose.
- ui-sidebar drops the phase-1 settings dropdown/modal; the foot renders
the new sidebar.settings slot with the column state.
- New ui-settings shell occupies sidebar.settings: foot trigger row and
the centered 1080x700 panel (figma 501:29947) with 24% mask, close
button / mask click / Escape all closing, and a 188px nav projected
from the settings.section list slot it declares. Nav labels are
registrant-localized; sections re-register on locale change, so the
ledger version is the shell's only subscription.
- ui-settings-general registers the General section: Permission and
Tool Call skeletons, live Language (locale menu) and Appearance
(Light/Dark/System cubes following the persisted preference); its
slot store mirrors both service snapshots via apply-side listeners.
- ui-settings-models registers the Models nav entry with an empty
content column.
- Portaled menus pin z-index above modal overlays (a menu anchored
inside the settings dialog rendered underneath it and was
unclickable).
- theme/data/list-pen icons in ui-primitives; settings copy ships as
zh/en dictionaries; fixture manifests gain the settings rows.
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