Studio: fully rounded Hub pills and refreshed menu icons (#6248)

Rounds out the Hub chrome and aligns a handful of icons with the rest
of the app. The header stat pills, HTTP/Xet toggle, HF token button,
info chips, status badges and the single-row download card are now full
pills, and the All formats style dropdown matches the composer + menu
geometry. Also widens the chat options menu so "Move to project" fits
on one line, and swaps a few icons to their HugeIcons equivalents.

Changes:
- hub.css: hub-tag-soft/hub-tag-meta pills go fully rounded; a single-
  row hub-download-card reads as a full pill via :has(), while the
  expanded card keeps its 22px radius, border and background.
- hub-option-menu.tsx: dropdown surface and items match the composer
  + menu (22px container, 10px side padding, 12px item radius).
- hf-token-indicator.tsx, transport-toggle.tsx: fully rounded with a
  fixed 26px height so they line up with the neighbouring pills.
- model-inspector.tsx, dot-tag.tsx, gguf-download-card.tsx: status and
  info chips go fully rounded.
- models-header.tsx: Eject uses RemoveCircleIcon; active model pill
  fully rounded.
- on-device-folders-dialog.tsx: folder rows use Folder02Icon.
- pickers.tsx: Recommended star uses the HugeIcons star.
- command.tsx, chat-search-dialog.tsx, prompt-storage-dialog.tsx: search
  fields use the HugeIcons Search01Icon.
- app-sidebar.tsx: chat options menu widened to w-56.

Pure styling and icon swaps, no behavior changes.

studio/frontend/src/components/ui/command.tsx

@@ -15,7 +15,7 @@ import {
 } from "@/components/ui/dialog";
 import { InputGroup, InputGroupAddon } from "@/components/ui/input-group";
 import { cn } from "@/lib/utils";
-import { SearchIcon, Tick02Icon } from "@hugeicons/core-free-icons";
+import { Search01Icon, Tick02Icon } from "@hugeicons/core-free-icons";
 import { HugeiconsIcon } from "@hugeicons/react";
 
 function Command({
@@ -86,7 +86,7 @@ function CommandInput({
         />
         <InputGroupAddon>
           <HugeiconsIcon
-            icon={SearchIcon}
+            icon={Search01Icon}
             strokeWidth={2}
             className="size-4 shrink-0 opacity-50"
           />