Refactor ConfigCard and SubscriptionCard for improved layout consistency

- Updated code elements in ConfigCard and SubscriptionCard to use `min-w-0` for better handling of long text and preventing overflow.
- Enhanced the layout of both components to ensure a more uniform appearance and improved user experience when displaying connection strings and subscription URLs.

frontend/src/features/configs/ConfigCard.tsx

@@ -121,7 +121,7 @@ export function ConfigCard({ config }: { config: VpnConfigDto }) {
             <div className="flex flex-col items-center gap-4">
               <QRCodeSVG value={linkQuery.data.connectionString} size={200} />
               <div className="flex w-full items-center gap-2">
-                <code className="flex-1 truncate rounded-md bg-muted px-2 py-1.5 text-xs">
+                <code className="min-w-0 flex-1 truncate rounded-md bg-muted px-2 py-1.5 text-xs">
                   {linkQuery.data.connectionString}
                 </code>
                 <Button size="icon" variant="outline" onClick={() => void copy(linkQuery.data!.connectionString)}>
@@ -130,7 +130,7 @@ export function ConfigCard({ config }: { config: VpnConfigDto }) {
               </div>
               <p className="text-xs text-muted-foreground">{t('configs.subscriptionLink')}</p>
               <div className="flex w-full items-center gap-2">
-                <code className="flex-1 truncate rounded-md bg-muted px-2 py-1.5 text-xs">
+                <code className="min-w-0 flex-1 truncate rounded-md bg-muted px-2 py-1.5 text-xs">
                   {linkQuery.data.subscriptionUrl}
                 </code>
                 <Button size="icon" variant="outline" onClick={() => void copy(linkQuery.data!.subscriptionUrl)}>

frontend/src/features/configs/SubscriptionCard.tsx

@@ -31,7 +31,7 @@ export function SubscriptionCard() {
       </CardHeader>
       <CardContent className="flex items-center gap-4">
         <QRCodeSVG value={data.subscriptionUrl} size={96} />
-        <div className="flex flex-1 flex-col gap-2">
+        <div className="flex min-w-0 flex-1 flex-col gap-2">
           <code className="truncate rounded-md bg-muted px-2 py-1.5 text-xs">{data.subscriptionUrl}</code>
           <Button size="sm" variant="outline" className="self-start" onClick={() => void copy()}>
             <Copy className="h-4 w-4" />