fix: update nullable fields in chat models and improve stream handling logic

Author: NarwhalChen

frontend/src/graphql/schema.gql

@@ -60,9 +60,7 @@ input CreateProjectInput {
   public: Boolean
 }
 
-"""
-Date custom scalar type
-"""
+"""Date custom scalar type"""
 scalar Date
 
 type EmailConfirmationResponse {
@@ -160,9 +158,7 @@ type Project {
   projectPath: String!
   subNumber: Float!
 
-  """
-  Projects that are copies of this project
-  """
+  """Projects that are copies of this project"""
   subscribers: [Project!]
   uniqueProjectId: String!
   updatedAt: Date!
@@ -246,9 +242,7 @@ input UpdateProjectPhotoInput {
   projectId: ID!
 }
 
-"""
-The `Upload` scalar type represents a file upload.
-"""
+"""The `Upload` scalar type represents a file upload."""
 scalar Upload
 
 type User {
@@ -263,8 +257,7 @@ type User {
   isEmailConfirmed: Boolean!
   lastEmailSendTime: Date!
   projects: [Project!]!
-  subscribedProjects: [Project!]
-    @deprecated(reason: "Use projects with forkedFromId instead")
+  subscribedProjects: [Project!] @deprecated(reason: "Use projects with forkedFromId instead")
   updatedAt: Date!
   username: String!
-}
+}