feat(room): add TypingEvent type and TypingStart/TypingStop event variants

Add TypingEvent struct in queue::types for broadcast-based typing
indicators, and TypingStart/TypingStop variants in RoomEventType for
WebSocket event dispatch.

libs/queue/lib.rs

@@ -7,7 +7,7 @@ pub mod worker;
 pub use producer::{MessageProducer, RedisPubSub};
 pub use types::{
     AgentTaskEvent, EmailEnvelope, ProjectRoomEvent, ReactionGroup, RoomMessageEnvelope,
-    RoomMessageEvent, RoomMessageStreamChunkEvent,
+    RoomMessageEvent, RoomMessageStreamChunkEvent, TypingEvent,
 };
 pub use worker::{
     room_worker_task, start as start_worker, start_email_worker, EmailSendFn, EmailSendFut, GetRedis,

libs/queue/types.rs

@@ -42,6 +42,17 @@ pub struct RoomMessageEvent {
     pub message_id: Option<Uuid>,
 }
 
+/// Typing indicator event — broadcast to all room members.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TypingEvent {
+    pub room_id: Uuid,
+    pub user_id: Uuid,
+    pub username: String,
+    pub avatar_url: Option<String>,
+    /// "start" or "stop"
+    pub action: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ReactionGroup {
     pub emoji: String,

libs/room/src/types.rs

@@ -33,6 +33,8 @@ pub enum RoomEventType {
     ReadReceipt,
     ReactionAdded,
     ReactionRemoved,
+    TypingStart,
+    TypingStop,
 }
 
 impl RoomEventType {
@@ -55,6 +57,8 @@ impl RoomEventType {
             RoomEventType::ReadReceipt => "read_receipt",
             RoomEventType::ReactionAdded => "reaction_added",
             RoomEventType::ReactionRemoved => "reaction_removed",
+            RoomEventType::TypingStart => "typing_start",
+            RoomEventType::TypingStop => "typing_stop",
         }
     }
 
@@ -77,6 +81,8 @@ impl RoomEventType {
             "read_receipt" => Some(RoomEventType::ReadReceipt),
             "reaction_added" => Some(RoomEventType::ReactionAdded),
             "reaction_removed" => Some(RoomEventType::ReactionRemoved),
+            "typing_start" => Some(RoomEventType::TypingStart),
+            "typing_stop" => Some(RoomEventType::TypingStop),
             _ => None,
         }
     }