Port upstream UI polish and refresh dependencies

Bring over selected Warp UI improvements: selectable Thought text, message
timestamps, animated theme backgrounds, editable New Window shortcuts,
safer tab renaming and restoration, and text/font/discard crash fixes.

Match upstream orchestration pill geometry and tooltips, and replace expanded
subagent previews with compact links that retain live status and conversation
navigation for launches and follow-up messages.

Include the pending Cargo.lock dependency refresh.

Adapted upstream PRs: #15948, #15884, #15691, #14618, #15772, #15705,
#15605, #14895, #15996, #15771, #14893, and #14603.

app/src/ai/active_agent_views_model.rs

@@ -255,6 +255,17 @@ impl ActiveAgentViewsModel {
         }
     }
 
+    /// Whether the terminal view still belongs to an attached pane, including hidden child panes.
+    pub(crate) fn is_terminal_view_attached(
+        &self,
+        terminal_view_id: EntityId,
+        ctx: &AppContext,
+    ) -> bool {
+        self.agent_view_handles
+            .get(&terminal_view_id)
+            .is_some_and(|handles| handles.controller.upgrade(ctx).is_some())
+    }
+
     pub fn handle_pane_focus_change(
         &mut self,
         window_id: WindowId,