Add desk-style task workflow on Activities and Project boards.

Managers can switch my desk vs team, reassign activities, and filter project cards to their work; assignees can see and move cards.

apps/api/src/activities/dto.ts

@@ -28,6 +28,10 @@ export class ListActivitiesQueryDto {
   @IsString()
   q?: string;
 
+  @IsOptional()
+  @IsIn(['mine', 'team'])
+  desk?: 'mine' | 'team';
+
   @IsOptional()
   @IsString()
   personId?: string;