feat: Add challenge dismissal GQL operations

- Add DismissChallenge/UndismissChallenge mutations
- Add IsChallengeDismissed query
- Add GetMyDismissedChallenges query
- Update schema with dismissal fields

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

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

src/operations/challenges.gql

@@ -25,6 +25,33 @@ query GetChallenges {
   }
 }
 
+query GetMyDismissedChallenges {
+  myDismissedChallenges {
+    id
+    name
+    description
+    minimumShots
+    startDate
+    endDate
+    createdAt
+    updatedAt
+    requiredTableSize
+    requiredPocketSize
+    isPublic
+    maxAttempts
+    ruleSet {
+      id
+      name
+      description
+    }
+    createdBy {
+      id
+      username
+      profileImageUri
+    }
+  }
+}
+
 query GetChallenge($id: ID!) {
   challenge(id: $id) {
     id
@@ -85,6 +112,7 @@ query GetChallengeLeaderboard($challengeId: ID!, $limit: Int) {
     makeRate
     qualified
     createdAt
+    attemptCount
     user {
       id
       username
@@ -240,3 +268,15 @@ mutation RecalculateChallengeEntry($entryId: ID!) {
     makesCount
   }
 }
+
+query IsChallengeDismissed($challengeId: ID!) {
+  isChallengeDismissed(challengeId: $challengeId)
+}
+
+mutation DismissChallenge($challengeId: ID!) {
+  dismissChallenge(challengeId: $challengeId)
+}
+
+mutation UndismissChallenge($challengeId: ID!) {
+  undismissChallenge(challengeId: $challengeId)
+}