Add playerSummaries to schema + Video fragments

Backs the multi-player vs UI: feed cards and the detail page both
read `video.playerSummaries`, a per-cluster rollup with username,
profile image, representative full-frame URL, makes/total/percentage.

  - PlayerSummaryFields fragment in shooter.gql
  - VideoCardFields (feed) and GetVideoDetails (detail) include
    playerSummaries via the new fragment
  - VideoCardFields tag selection extended to include tagClasses,
    needed for the FE's player_count detection

Generated by `just gql` from the BE additions in railbird PR
dean/video-player-summaries.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/schema.gql

@@ -406,6 +406,7 @@ type VideoGQL {
   currentProcessing: VideoProcessingGQL
   reactions: [ReactionGQL!]!
   comments: [CommentGQL!]!
+  playerSummaries: [PlayerSummaryGQL!]!
 }
 
 type ShotGQL {
@@ -665,6 +666,17 @@ type CommentGQL {
   replies: [CommentGQL!]!
 }
 
+type PlayerSummaryGQL {
+  clusterId: Int!
+  userId: Int
+  username: String
+  profileImageUri: String
+  representativeFullFrameUrl: String
+  totalShots: Int!
+  totalShotsMade: Int!
+  makePercentage: Float!
+}
+
 type DeployedConfigGQL {
   allowNewUsers: Boolean!
   firebase: Boolean!