fix: replace all remaining old brand tokens (text-brand-dark, border-brand-border, bg-white opacity)

30 references to removed CSS variables: border-brand-border → border-[#1e2130],
text-brand-text-muted → text-[#4f5666], text-brand-dark → text-white,
bg-white/[0.04] → bg-[#191c25], hover:border-white/[0.12] → hover:border-[#2a2f3d].

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/script-editor/ScriptTemplateListView.tsx

@@ -138,7 +138,7 @@ export function ScriptTemplateListView({ onEdit, onCreate }: Props) {
               {templates.map(t => (
                 <tr
                   key={t.id}
-                  className="border-b border-[#1e2130] last:border-b-0 hover:bg-white/[0.02] transition-colors"
+                  className="border-b border-[#1e2130] last:border-b-0 hover:bg-[#14161d] transition-colors"
                 >
                   <td className="px-4 py-3">
                     <span className="text-[#e2e5eb] font-medium">{t.name}</span>