debug(typst): force arg keys bright red to confirm token pipeline

Adds { tag: t.attributeName, color: '#cc0000', fontWeight: 'bold' } to
typstHighlightStyle so named arg keys are unmistakably red if the
CodeArgKey token is reaching the highlighter.  Will be removed once
the pipeline is confirmed working and replaced with per-theme colors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/web/frontend/js/features/source-editor/languages/typst/index.ts

@@ -101,6 +101,8 @@ const typstHighlightStyle = HighlightStyle.define([
   { tag: t.heading, fontWeight: 'bold' },
   { tag: t.strong, fontWeight: 'bold' },
   { tag: t.emphasis, fontStyle: 'italic' },
+  // Diagnostic: force arg keys bright red so we can confirm the token reaches the highlighter.
+  { tag: t.attributeName, color: '#cc0000', fontWeight: 'bold' },
 ])
 
 export const typst = () => {