feat: enhance maintenance details page with issue history navigation and responsive layout improvements

src/app/admin/bikers/[id]/page.tsx

@@ -862,7 +862,7 @@ export default function BikerDetailPage() {
         <ArrowLeft className="w-4 h-4" /> Back to Bikers
       </button>
 
-      <div className="bg-white rounded-xl shadow-sm border border-slate-100 overflow-hidden mb-4">
+      <div className="bg-white rounded-xl shadow-sm border border-slate-100 overflow-hidden mb-8">
         <div className="p-4 lg:p-6 flex flex-col lg:flex-row lg:items-center gap-4">
           <div className="relative group">
             {biker.profileImage ? (