feat(chat): persistance bornee du brouillon custom chat par projet/layout (#182)

crates/domain/src/lib.rs

@@ -34,6 +34,7 @@ pub mod agent;
 pub mod agent_tool_policy;
 pub mod background_task;
 pub mod chat_attachment;
+pub mod chat_draft;
 pub mod conversation;
 pub mod conversation_log;
 pub mod device;
@@ -106,6 +107,7 @@ pub use background_task::{
 pub use chat_attachment::{
     ChatAttachment, ChatAttachmentError, ChatAttachmentId, ChatAttachmentSourceKind,
 };
+pub use chat_draft::{ChatDraft, ChatDraftError, ChatDraftKey, CHAT_DRAFT_MAX_BYTES};
 
 pub use skill::{Skill, SkillKind, SkillRef, SkillScope};