fix: react-doctor control-has-associated-label 137→? (auto aria-labels)

Add aria-label to buttons (icon-only, pagination, action) and inputs
(placeholder-derived) via balanced-brace JSX parser. Files with complex
onClick expressions (deep brace nesting) skipped to avoid breakage.

src/components/admin/CampaignListPanel.tsx

@@ -178,7 +178,7 @@ function NewCampaignModal({
           <button type="button"
             onClick={onClose}
             className="px-4 py-2 text-sm font-medium text-[var(--admin-text-muted)] hover:text-[var(--admin-text-primary)] transition-colors"
-          >
+           aria-label="Cancel">
             Cancel
           </button>
           <button type="button"
@@ -234,7 +234,7 @@ export default function CampaignListPanel({ initialCampaigns, brandId = "6429430
         <button type="button"
           onClick={() => setShowNewModal(true)}
           className="inline-flex items-center gap-1.5 rounded-lg bg-emerald-600 px-3 sm:px-4 py-2 text-xs sm:text-sm font-semibold text-white hover:bg-emerald-700 transition-colors"
-        >
+         aria-label="New Campaign">
           {Icons.plus("h-3.5 w-3.5 sm:h-4 sm:w-4")}
           <span>New Campaign</span>
         </button>