fix: address code review accessibility feedback for section icons, summary gear, and subsections

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/components/src/custom/config-field-renderer.tsx

@@ -249,7 +249,7 @@ export function ConfigFieldRenderer({
               {field.summaryText ?? effectiveValue ?? ''}
             </span>
             {field.onSummaryClick && (
-              <Settings className="h-3.5 w-3.5 text-muted-foreground shrink-0" data-testid={`config-field-${field.key}-gear`} />
+              <Settings className="h-3.5 w-3.5 text-muted-foreground shrink-0" aria-hidden="true" data-testid={`config-field-${field.key}-gear`} />
             )}
           </div>
         </ConfigRow>

packages/components/src/custom/config-panel-renderer.tsx

@@ -249,7 +249,7 @@ export function ConfigPanelRenderer({
                     if (sub.visibleWhen && !sub.visibleWhen(draft)) return null;
                     const subCollapsed = isCollapsed(sub.key, sub.defaultCollapsed);
                     return (
-                      <div key={sub.key} data-testid={`config-subsection-${sub.key}`} className="ml-1">
+                      <div key={sub.key} data-testid={`config-subsection-${sub.key}`} className="ml-1" role="group" aria-label={sub.title}>
                         <SectionHeader
                           title={sub.title}
                           icon={sub.icon}

packages/components/src/custom/section-header.tsx

@@ -36,7 +36,7 @@ export interface SectionHeaderProps {
 function SectionHeader({ title, icon, collapsible, collapsed, onToggle, testId, className }: SectionHeaderProps) {
   const titleContent = (
     <h3 className="text-xs font-semibold text-foreground uppercase tracking-wider flex items-center gap-1.5">
-      {icon && <span className="text-muted-foreground shrink-0">{icon}</span>}
+      {icon && <span className="text-muted-foreground shrink-0" aria-hidden="true">{icon}</span>}
       {title}
     </h3>
   )