refactor(outliner): remove redundant /bullet slash command

frontend/src/features/workspace/OutlinerBlock.tsx

@@ -10,7 +10,6 @@ import {
   Heading2,
   Heading3,
   ListTodo,
-  Type,
   Minus,
   MessageSquare,
   Hash,
@@ -32,7 +31,6 @@ const SLASH_COMMANDS: SlashCommand[] = [
   { type: 'h1', label: '/h1', desc: 'Große Überschrift', icon: <Heading1 className="w-3.5 h-3.5" /> },
   { type: 'h2', label: '/h2', desc: 'Abschnitts-Überschrift', icon: <Heading2 className="w-3.5 h-3.5" /> },
   { type: 'h3', label: '/h3', desc: 'Unterabschnitt', icon: <Heading3 className="w-3.5 h-3.5" /> },
-  { type: 'bullet', label: '/bullet', desc: 'Standard Listenpunkt', icon: <Type className="w-3.5 h-3.5" /> },
   { type: 'code', label: '/code', desc: 'Code-Block mit Syntax', icon: <Code className="w-3.5 h-3.5" /> },
   { type: 'callout', label: '/callout', desc: 'Hinweisbox', icon: <MessageSquare className="w-3.5 h-3.5" /> },
   { type: 'divider', label: '/divider', desc: 'Trennlinie', icon: <Minus className="w-3.5 h-3.5" /> },