feat: Add following and followers to GetUser query

Adds following and followers arrays to the GetUser query to support
displaying follower/following counts on other users' profiles.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/operations/user.gql

@@ -34,6 +34,12 @@ query getLoggedInUser {
 query GetUser($userId: Int!) {
   getUser(userId: $userId) {
     ...UserFragment
+    following {
+      id
+    }
+    followers {
+      id
+    }
   }
 }