feat: private messages.

crates/chattyness-db/src/ws_messages.rs

@@ -7,6 +7,12 @@ use uuid::Uuid;
 
 use crate::models::{AvatarRenderData, ChannelMemberInfo, ChannelMemberWithAvatar, LooseProp};
 
+/// Default function for serde that returns true (for is_same_scene field).
+/// Must be pub for serde derive macro to access via full path.
+pub fn default_is_same_scene() -> bool {
+    true
+}
+
 /// WebSocket configuration sent to client on connect.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct WsConfig {
@@ -47,10 +53,13 @@ pub enum ClientMessage {
     /// Ping to keep connection alive.
     Ping,
 
-    /// Send a chat message to the channel.
+    /// Send a chat message to the channel or directly to a user.
     SendChatMessage {
         /// Message content (max 500 chars).
         content: String,
+        /// Target display name for direct whisper. None = broadcast to scene.
+        #[serde(default)]
+        target_display_name: Option<String>,
     },
 
     /// Drop a prop from inventory to the canvas.
@@ -154,6 +163,16 @@ pub enum ServerMessage {
         y: f64,
         /// Server timestamp (milliseconds since epoch).
         timestamp: i64,
+        /// Whether this is a whisper (direct message).
+        /// Default: false (broadcast message).
+        #[serde(default)]
+        is_whisper: bool,
+        /// Whether sender is in the same scene as recipient.
+        /// For whispers: true = same scene (show as bubble), false = cross-scene (show as notification).
+        /// For broadcasts: always true.
+        /// Default: true (same scene).
+        #[serde(default = "self::default_is_same_scene")]
+        is_same_scene: bool,
     },
 
     /// Initial list of loose props when joining channel.