feat(web): restyle hero preview badge and grow wide-sidebar settings icon

The hero Preview tag becomes a superscript mono pill riding the title's
top-right (r24, bordered, business-tertiary fill), colored by the new
--dsw-alias-label-primary-bluish alias over --dsw-static-blue-900 — the
first design-owner-approved addition under the token-sheet authority
exception recorded in the ui-theme README. The expanded sidebar trigger
now uses the native 16px settings icon instead of the 14px asset.

packages/client/ui-settings-general/src/client/chrome.tsx

@@ -4,7 +4,7 @@
  * The shell renders the surrounding chrome (button, nav heading row) and
  * reads each entry's `label` option for aria text.
  */
-import { IconSettingsOutline14 } from '@deepseek-ai/dsh-client-ui-primitives'
+import { IconSettingsOutline14, IconSettingsOutline16 } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { PropsLocale, PropsRuntime } from '@deepseek-ai/dsh-client-ui-slots'
 import css from './chrome.module.css'
 
@@ -22,7 +22,7 @@ export type HeaderContentProps = PropsRuntime<'settings.header'> & PropsLocale<'
 export function TriggerContent({ wide, t }: TriggerContentProps) {
   return (
     <>
-      <IconSettingsOutline14 size={wide ? 14 : 18} />
+      {wide ? <IconSettingsOutline16 size={16} /> : <IconSettingsOutline14 size={18} />}
       {wide && <span className={css.triggerLabel}>{t('trigger')}</span>}
     </>
   )