agent_ui: Add mode_id to telemetry (#43045)

Release Notes:

- N/A

crates/agent_ui/src/acp/mode_selector.rs

@@ -56,6 +56,10 @@ impl ModeSelector {
         self.set_mode(all_modes[next_index].id.clone(), cx);
     }
 
+    pub fn mode(&self) -> acp::SessionModeId {
+        self.connection.current_mode()
+    }
+
     pub fn set_mode(&mut self, mode: acp::SessionModeId, cx: &mut Context<Self>) {
         let task = self.connection.set_mode(mode, cx);
         self.setting_mode = true;

crates/agent_ui/src/acp/thread_view.rs

@@ -1135,6 +1135,7 @@ impl AcpThreadView {
 
         self.is_loading_contents = true;
         let model_id = self.current_model_id(cx);
+        let mode_id = self.current_mode_id(cx);
         let guard = cx.new(|_| ());
         cx.observe_release(&guard, |this, _guard, cx| {
             this.is_loading_contents = false;
@@ -1169,7 +1170,8 @@ impl AcpThreadView {
                     "Agent Message Sent",
                     agent = agent_telemetry_id,
                     session = session_id,
-                    model = model_id
+                    model = model_id,
+                    mode = mode_id
                 );
 
                 thread.send(contents, cx)
@@ -1182,6 +1184,7 @@ impl AcpThreadView {
                 agent = agent_telemetry_id,
                 session = session_id,
                 model = model_id,
+                mode = mode_id,
                 status,
                 turn_time_ms,
             );
@@ -5405,6 +5408,16 @@ impl AcpThreadView {
         )
     }
 
+    fn current_mode_id(&self, cx: &App) -> Option<Arc<str>> {
+        if let Some(thread) = self.as_native_thread(cx) {
+            Some(thread.read(cx).profile().0.clone())
+        } else if let Some(mode_selector) = self.mode_selector() {
+            Some(mode_selector.read(cx).mode().0)
+        } else {
+            None
+        }
+    }
+
     fn current_model_id(&self, cx: &App) -> Option<String> {
         self.model_selector
             .as_ref()