agent: Change loading label if command is waiting on permission (#27955)

If there's a command pending confirmation, the label changes from
"Generating" to "Waiting for confirmation".

<img
src="https://github.com/user-attachments/assets/d804e382-5315-40b0-9588-c257cca2430c"
width="600"/>

Release Notes:

- N/A

crates/agent/src/message_editor.rs

@@ -341,6 +341,9 @@ impl Render for MessageEditor {
         let is_too_long = thread.is_getting_too_long(cx);
         let is_model_selected = self.is_model_selected(cx);
         let is_editor_empty = self.is_editor_empty(cx);
+        let needs_confirmation =
+            thread.has_pending_tool_uses() && thread.tools_needing_confirmation().next().is_some();
+
         let submit_label_color = if is_editor_empty {
             Color::Muted
         } else {
@@ -432,11 +435,17 @@ impl Render for MessageEditor {
                                         },
                                     ),
                             )
-                            .child(
-                                Label::new("Generating…")
-                                    .size(LabelSize::XSmall)
-                                    .color(Color::Muted),
-                            )
+                            .child({
+
+
+                                Label::new(if needs_confirmation {
+                                    "Waiting for confirmation…"
+                                } else {
+                                    "Generating…"
+                                })
+                                .size(LabelSize::XSmall)
+                                .color(Color::Muted)
+                            })
                             .child(ui::Divider::vertical())
                             .child(
                                 Button::new("cancel-generation", "Cancel")