feat: image variants settings screens

docs/design/screens/image-variants.md

@@ -31,6 +31,9 @@ Admin-only page under Settings → Media, with two tabs: Variants and Cache. Des
 | 1i | Delete confirm | Delete in the row menu. |
 | 1j | Delete in progress | Delete was confirmed. The button shows a spinner. |
 | 1k | Request reference | Mobile scrolled to the reference card. On desktop it is visible below the table. |
+| 1l | Entry: sidebar | From any page, Settings expands in the sidebar to Media: Variants and Cache. Admin only. On mobile the menu button opens it as a drawer. |
+
+**Sidebar entry (1l).** For owner and admin, the Settings item has a chevron (right when closed, down when open) and expands to a group: a muted uppercase label "Media" (11 px, semibold, 0.04em tracking), then "Variants" (layers icon) and "Cache" (database icon). The group is indented 19 px with a 1 px left border; its items are 32 px high (44 px in the mobile drawer) with 14 px icons. The group is open on every `/settings` route. When a subpage is current, its item takes the sand fill and Settings keeps only the highlighted text and medium weight. On `/settings` itself Settings is the current item. Other roles see no chevron and no group. Cache stays inert until its screen exists.
 
 ### Copy: Variants list