feat(native): "Mark as read" button on rich toasts (#9)

Toasts with a room id get a Mark as read action next to Send; it emits
`lotus-notification-mark-read {roomId}` without raising the window, and
cinny marks the room read through its existing markAsRead path. Invite
toasts (no room id) get neither button.

Bump cinny to 23649f12.

Closes #9

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src-tauri/src/native/toast.rs

@@ -24,6 +24,10 @@
 //! `thread_id`), never the tag. Toasts without a room id (invites) get no reply
 //! box.
 //!
+//! Mark as read (cinny-desktop #9): toasts with a room id also carry a
+//! **Mark as read** button (`arguments="mark_read"`); activating it forwards the
+//! room id so the web client sends the read receipt, without raising the window.
+//!
 //! If ANY WinRT step fails (most importantly: no registered AppUserModelID — see
 //! the runtime note below), we fall back to the plain `tauri-plugin-notification`
 //! notification so notifications always work.
@@ -161,13 +165,17 @@ fn show_windows_toast(
         _ => String::new(),
     };
 
-    // An inline reply input and a foreground Send action, only when there is a
-    // room to reply to. `hint-inputId="reply"` binds the Send button to the text
-    // box so the reply text arrives in `UserInput()` keyed "reply".
+    // An inline reply input, a Send action and Mark as read, only when there is
+    // a room to act on. `hint-inputId="reply"` binds the Send button to the text
+    // box so the reply text arrives in `UserInput()` keyed "reply". Both are
+    // "foreground" because the in-process Activated event (not COM background
+    // activation) is what an unpackaged app receives; `arguments` tells them
+    // apart.
     let actions = if room_id.is_some() {
         r#"<actions>
     <input id="reply" type="text" placeHolder="Reply..."/>
     <action content="Send" arguments="reply" activationType="foreground" hint-inputId="reply"/>
+    <action content="Mark as read" arguments="mark_read" activationType="foreground"/>
   </actions>"#
     } else {
         ""
@@ -225,8 +233,19 @@ fn show_windows_toast(
 
             // Extract the reply text (if the Send action / input was used).
             let reply = read_reply(&activated_args).unwrap_or_default();
+            let action = activated_args
+                .Arguments()
+                .map(|a| a.to_string())
+                .unwrap_or_default();
 
-            if !reply.is_empty() {
+            if action == "mark_read" {
+                // Mark as read: no window raise, like the quick reply.
+                let payload = serde_json::json!({
+                    "roomId": room_id_owned.as_deref(),
+                })
+                .to_string();
+                super::emit_to_web(&app_activated, "lotus-notification-mark-read", &payload);
+            } else if !reply.is_empty() {
                 // Quick reply: forward the room id + text to the web client.
                 let payload = serde_json::json!({
                     "roomId": room_id_owned.as_deref(),