fix server cards stretching to fill row height

Add grid-align-start class to SimpleGrid so cards size to their own
content instead of stretching to match the tallest card in the row.
Remove unused card-responsive CSS.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/organisms/ServerListScreen/ServerListScreen.tsx

@@ -40,7 +40,7 @@ export function ServerListScreen({
             No servers configured. Add a server to get started.
           </Text>
         ) : (
-          <SimpleGrid cols={{ base: 1, md: 2 }} spacing="lg">
+          <SimpleGrid cols={{ base: 1, md: 2 }} spacing="lg" className="grid-align-start">
             {servers.map((server) => (
               <ServerCard key={server.name} {...server} />
             ))}