Add running-task exit choices to local daemon sessions (#38447)

## What changed

When `Ctrl-C` is pressed with an empty composer while a task is running in a local daemon session, show a menu that lets the user:

- cancel the task and stay in Codex;
- exit Codex while leaving the task running; or
- stop the task and exit Codex.

Do not offer background execution for side-thread tasks or when follow-up messages are queued. Preserve existing `Ctrl-C` behavior for non-daemon sessions, drafts, paste bursts, MCP startup, and returning from an active side thread.

## Testing

Add TUI tests for each exit action, menu dismissal, side threads, queued follow-ups, composer input, MCP startup, and non-daemon sessions.

GitOrigin-RevId: 539c33d3a4ff288a015bddbe9465d2bbdbe018d0

codex-rs/tui/src/chatwidget/interaction.rs

@@ -496,15 +496,20 @@ impl ChatWidget {
         self.bottom_pane.is_task_running() || self.review.is_review_mode
     }
 
-    fn pause_active_goal_for_interrupt(&self) {
-        if !self.turn_lifecycle.agent_turn_running {
-            return;
-        }
-        if !self
-            .current_goal_status
-            .as_ref()
-            .is_some_and(GoalStatusState::is_active)
-        {
+    pub(crate) fn is_agent_turn_running(&self) -> bool {
+        self.turn_lifecycle.agent_turn_running
+    }
+
+    pub(crate) fn is_active_goal_turn_running(&self) -> bool {
+        self.turn_lifecycle.agent_turn_running
+            && self
+                .current_goal_status
+                .as_ref()
+                .is_some_and(GoalStatusState::is_active)
+    }
+
+    pub(crate) fn pause_active_goal_for_interrupt(&self) {
+        if !self.is_active_goal_turn_running() {
             return;
         }
         let Some(thread_id) = self.thread_id else {

codex-rs/tui/src/chatwidget/turn_runtime.rs

@@ -294,7 +294,7 @@ impl ChatWidget {
         None
     }
 
-    pub(super) fn has_queued_follow_up_messages(&self) -> bool {
+    pub(crate) fn has_queued_follow_up_messages(&self) -> bool {
         self.input_queue.has_queued_follow_up_messages()
     }