Display pending child-thread approvals in TUI (#12767)

Summary
- propagate approval policy from parent to spawned agents and drop the
Never override so sub-agents respect the caller’s request
- refresh the pending-approval list whenever events arrive or the active
thread changes and surface the list above the composer for inactive
threads
- add widgets, helpers, and tests covering the new pending-thread
approval UI state

![Uploading Screenshot 2026-02-25 at 11.02.18.png…]()

codex-rs/tui/src/bottom_pane/mod.rs

@@ -17,6 +17,7 @@ use std::path::PathBuf;
 
 use crate::app_event::ConnectorsSnapshot;
 use crate::app_event_sender::AppEventSender;
+use crate::bottom_pane::pending_thread_approvals::PendingThreadApprovals;
 use crate::bottom_pane::queued_user_messages::QueuedUserMessages;
 use crate::bottom_pane::unified_exec_footer::UnifiedExecFooter;
 use crate::key_hint;
@@ -92,6 +93,7 @@ pub(crate) use skills_toggle_view::SkillsToggleView;
 pub(crate) use status_line_setup::StatusLineItem;
 pub(crate) use status_line_setup::StatusLineSetupView;
 mod paste_burst;
+mod pending_thread_approvals;
 pub mod popup_consts;
 mod queued_user_messages;
 mod scroll_state;
@@ -171,6 +173,8 @@ pub(crate) struct BottomPane {
     unified_exec_footer: UnifiedExecFooter,
     /// Queued user messages to show above the composer while a turn is running.
     queued_user_messages: QueuedUserMessages,
+    /// Inactive threads with pending approval requests.
+    pending_thread_approvals: PendingThreadApprovals,
     context_window_percent: Option<i64>,
     context_window_used_tokens: Option<i64>,
 }
@@ -219,6 +223,7 @@ impl BottomPane {
             status: None,
             unified_exec_footer: UnifiedExecFooter::new(),
             queued_user_messages: QueuedUserMessages::new(),
+            pending_thread_approvals: PendingThreadApprovals::new(),
             esc_backtrack_hint: false,
             animations_enabled,
             context_window_percent: None,
@@ -759,6 +764,18 @@ impl BottomPane {
         self.request_redraw();
     }
 
+    /// Update the inactive-thread approval list shown above the composer.
+    pub(crate) fn set_pending_thread_approvals(&mut self, threads: Vec<String>) {
+        if self.pending_thread_approvals.set_threads(threads) {
+            self.request_redraw();
+        }
+    }
+
+    #[cfg(test)]
+    pub(crate) fn pending_thread_approvals(&self) -> &[String] {
+        self.pending_thread_approvals.threads()
+    }
+
     /// Update the unified-exec process set and refresh whichever summary surface is active.
     ///
     /// The summary may be displayed inline in the status row or as a dedicated
@@ -980,14 +997,20 @@ impl BottomPane {
             if self.status.is_none() && !self.unified_exec_footer.is_empty() {
                 flex.push(0, RenderableItem::Borrowed(&self.unified_exec_footer));
             }
+            let has_pending_thread_approvals = !self.pending_thread_approvals.is_empty();
             let has_queued_messages = !self.queued_user_messages.messages.is_empty();
             let has_status_or_footer =
                 self.status.is_some() || !self.unified_exec_footer.is_empty();
-            if has_queued_messages && has_status_or_footer {
+            let has_inline_previews = has_pending_thread_approvals || has_queued_messages;
+            if has_inline_previews && has_status_or_footer {
+                flex.push(0, RenderableItem::Owned("".into()));
+            }
+            flex.push(1, RenderableItem::Borrowed(&self.pending_thread_approvals));
+            if has_pending_thread_approvals && has_queued_messages {
                 flex.push(0, RenderableItem::Owned("".into()));
             }
             flex.push(1, RenderableItem::Borrowed(&self.queued_user_messages));
-            if !has_queued_messages && has_status_or_footer {
+            if !has_inline_previews && has_status_or_footer {
                 flex.push(0, RenderableItem::Owned("".into()));
             }
             let mut flex2 = FlexRenderable::new();