Fix AI chat streaming persistence when command menu closes (#14854)

Closes [#1583](https://github.com/twentyhq/core-team-issues/issues/1583)


- Removed `messageId` column from `File` table and its references in
code (unrelated to this PR)
- Updated AI chat to use React Context API with persistent provider in
`CommandMenuContainer`
- Converted all AI chat component states to regular Recoil atoms (no
instance context needed)

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-server/src/engine/metadata-modules/agent/agent-chat-message.entity.ts

@@ -10,7 +10,6 @@ import {
   Relation,
 } from 'typeorm';
 
-import { FileEntity } from 'src/engine/core-modules/file/entities/file.entity';
 import { AgentChatThreadEntity } from 'src/engine/metadata-modules/agent/agent-chat-thread.entity';
 
 import { AgentChatMessagePartEntity } from './agent-chat-message-part.entity';
@@ -41,9 +40,6 @@ export class AgentChatMessageEntity {
   @OneToMany(() => AgentChatMessagePartEntity, (part) => part.message)
   parts: Relation<AgentChatMessagePartEntity[]>;
 
-  @OneToMany(() => FileEntity, (file) => file.message)
-  files: Relation<FileEntity[]>;
-
   @CreateDateColumn()
   createdAt: Date;
 }

packages/twenty-server/src/engine/metadata-modules/agent/dtos/agent-chat-message.dto.ts

@@ -1,7 +1,6 @@
 import { Field, ObjectType } from '@nestjs/graphql';
 
 import { UUIDScalarType } from 'src/engine/api/graphql/workspace-schema-builder/graphql-types/scalars';
-import { FileDTO } from 'src/engine/core-modules/file/dtos/file.dto';
 
 import { AgentChatMessagePartDTO } from './agent-chat-message-part.dto';
 
@@ -19,9 +18,6 @@ export class AgentChatMessageDTO {
   @Field(() => [AgentChatMessagePartDTO])
   parts: AgentChatMessagePartDTO[];
 
-  @Field(() => [FileDTO])
-  files: FileDTO[];
-
   @Field()
   createdAt: Date;
 }