feat: real-time email & calendar tabs on record pages (#21953)

emails and calendar tabs only refreshed on reload, unlike timeline. this
subscribes to the participant object (messageParticipant /
calendarEventParticipant) for the record's related people over the
existing sse stream and refetches on change.

relatedPersonIds is resolved server-side so any object with the tab
inherits it, no per-object code. resolver stays the source of truth so
visibility masking is untouched.

packages/twenty-server/src/engine/core-modules/messaging/dtos/timeline-threads-with-total.dto.ts

@@ -1,5 +1,6 @@
 import { Field, Int, ObjectType } from '@nestjs/graphql';
 
+import { UUIDScalarType } from 'src/engine/api/graphql/workspace-schema-builder/graphql-types/scalars';
 import { TimelineThreadDTO } from 'src/engine/core-modules/messaging/dtos/timeline-thread.dto';
 
 @ObjectType('TimelineThreadsWithTotal')
@@ -9,4 +10,7 @@ export class TimelineThreadsWithTotalDTO {
 
   @Field(() => [TimelineThreadDTO])
   timelineThreads: TimelineThreadDTO[];
+
+  @Field(() => [UUIDScalarType])
+  relatedPersonIds: string[];
 }

packages/twenty-server/src/engine/core-modules/messaging/services/get-messages.service.ts

@@ -34,6 +34,7 @@ export class GetMessagesService {
       return {
         totalNumberOfThreads: 0,
         timelineThreads: [],
+        relatedPersonIds: personIds,
       };
     }
 
@@ -61,6 +62,7 @@ export class GetMessagesService {
         threadParticipantsByThreadId,
         threadVisibilityByThreadId,
       ),
+      relatedPersonIds: personIds,
     };
   }
 
@@ -82,6 +84,7 @@ export class GetMessagesService {
       return {
         totalNumberOfThreads: 0,
         timelineThreads: [],
+        relatedPersonIds: [],
       };
     }