fix: increase kcp tunnel bandwidth limit and fix modal backgrounds

vite-frontend/src/pages/forward.tsx

@@ -5401,7 +5401,7 @@ export default function ForwardPage() {
         <ModalContent>
           {(onClose) => (
             <>
-              <ModalHeader className="flex flex-col gap-1 bg-content1 border-b border-divider">
+              <ModalHeader className="flex flex-col gap-1 border-b border-divider">
                 <h2 className="text-xl font-bold">规则诊断结果</h2>
                 {currentDiagnosisForward && (
                   <div className="flex items-center gap-2 min-w-0">
@@ -5943,7 +5943,7 @@ export default function ForwardPage() {
                   </div>
                 )}
               </ModalBody>
-              <ModalFooter className="bg-transparent border-t border-divider">
+              <ModalFooter className="border-t border-divider">
                 <Button variant="light" onPress={onClose}>
                   关闭
                 </Button>