fix(frontend): address round-2 review — aria-label, email fallback, last dark: class

- Add aria-label="Reset scope" to select elements in RateLimitDisplay
  and RateLimitModal for screen reader accessibility
- Fall back to userId when userEmail is empty in RateLimitModal dialog
  description so admins always see an identifier
- Remove last remaining dark:bg-gray-900 class in RateLimitManager

autogpt_platform/frontend/src/app/(platform)/admin/rate-limits/components/RateLimitDisplay.tsx

@@ -61,6 +61,7 @@ export function RateLimitDisplay({ data, onReset }: Props) {
 
       <div className="mt-6 flex items-center gap-3 border-t pt-4">
         <select
+          aria-label="Reset scope"
           value={resetWeekly ? "both" : "daily"}
           onChange={(e) => setResetWeekly(e.target.value === "both")}
           className="rounded-md border bg-white px-3 py-1.5 text-sm"

autogpt_platform/frontend/src/app/(platform)/admin/rate-limits/components/RateLimitManager.tsx

@@ -219,7 +219,7 @@ export function RateLimitManager() {
 
       {/* User selection list -- always require explicit selection */}
       {searchResults.length >= 1 && !selectedUser && (
-        <div className="rounded-md border bg-white p-4 dark:bg-gray-900">
+        <div className="rounded-md border bg-white p-4">
           <h3 className="mb-2 text-sm font-medium text-gray-700">
             Select a user ({searchResults.length}{" "}
             {searchResults.length === 1 ? "result" : "results"})

autogpt_platform/frontend/src/app/(platform)/admin/spending/components/RateLimitModal.tsx

@@ -125,7 +125,7 @@ export function RateLimitModal({
           <DialogHeader>
             <DialogTitle>Rate Limits</DialogTitle>
             <DialogDescription>
-              CoPilot rate limits for {userEmail}
+              CoPilot rate limits for {userEmail || userId}
             </DialogDescription>
           </DialogHeader>
 
@@ -160,6 +160,7 @@ export function RateLimitModal({
 
               <div className="flex items-center gap-3 border-t pt-4">
                 <select
+                  aria-label="Reset scope"
                   value={resetWeekly ? "both" : "daily"}
                   onChange={(e) => setResetWeekly(e.target.value === "both")}
                   className="rounded-md border bg-white px-3 py-1.5 text-sm"