feed: select uploadCompletionCursor on VideoCardFields stream

Lets the client distinguish a finalized-but-not-fully-uploaded stream
(is_completed set, but received cursor short of last_intended_segment_bound)
from one that is genuinely processing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/index.tsx

@@ -4784,6 +4784,7 @@ export type GetFeedQuery = {
         __typename?: "UploadStreamGQL";
         id: string;
         lastIntendedSegmentBound?: number | null;
+        uploadCompletionCursor: number;
         streamSegmentType: StreamSegmentTypeEnum;
         isCompleted: boolean;
         lastSegmentUploadedAt?: any | null;
@@ -4898,6 +4899,7 @@ export type VideoCardFieldsFragment = {
     __typename?: "UploadStreamGQL";
     id: string;
     lastIntendedSegmentBound?: number | null;
+    uploadCompletionCursor: number;
     streamSegmentType: StreamSegmentTypeEnum;
     isCompleted: boolean;
     lastSegmentUploadedAt?: any | null;
@@ -5045,6 +5047,7 @@ export type GetVideoFeedQuery = {
         __typename?: "UploadStreamGQL";
         id: string;
         lastIntendedSegmentBound?: number | null;
+        uploadCompletionCursor: number;
         streamSegmentType: StreamSegmentTypeEnum;
         isCompleted: boolean;
         lastSegmentUploadedAt?: any | null;
@@ -8193,6 +8196,7 @@ export type GetVideoCardQuery = {
       __typename?: "UploadStreamGQL";
       id: string;
       lastIntendedSegmentBound?: number | null;
+      uploadCompletionCursor: number;
       streamSegmentType: StreamSegmentTypeEnum;
       isCompleted: boolean;
       lastSegmentUploadedAt?: any | null;
@@ -9020,6 +9024,7 @@ export const VideoCardFieldsFragmentDoc = gql`
     stream {
       id
       lastIntendedSegmentBound
+      uploadCompletionCursor
       streamSegmentType
       isCompleted
       lastSegmentUploadedAt

src/operations/feed.gql

@@ -41,6 +41,7 @@ fragment VideoCardFields on VideoGQL {
   stream {
     id
     lastIntendedSegmentBound
+    uploadCompletionCursor
     streamSegmentType
     isCompleted
     lastSegmentUploadedAt