agent_ui: Simplify labels in new thread menu (zed-industries#42746)

Drop the "new", it's simpler! 😆 

| Before | After |
|--------|--------|
| <img width="800" height="932" alt="Screenshot 2025-11-14 at 2  48@2x"
src="https://github.com/user-attachments/assets/efa67d57-9b5c-4eef-8dc7-f36c8e6a4a90"
/> | <img width="800" height="772" alt="Screenshot 2025-11-14 at 2 
47@2x"
src="https://github.com/user-attachments/assets/042d2a0b-24b4-4ad5-8411-82e0eafb993f"
/> |




Release Notes:

- N/A

Author: danilo-leal

crates/agent_ui/src/agent_panel.rs

@@ -1905,7 +1905,6 @@ impl AgentPanel {
                     let active_thread = active_thread.clone();
                     Some(ContextMenu::build(window, cx, |menu, _window, cx| {
                         menu.context(focus_handle.clone())
-                            .header("Zed Agent")
                             .when_some(active_thread, |this, active_thread| {
                                 let thread = active_thread.read(cx);
 
@@ -1929,9 +1928,9 @@ impl AgentPanel {
                                 }
                             })
                             .item(
-                                ContextMenuEntry::new("New Thread")
+                                ContextMenuEntry::new("Zed Agent")
                                     .action(NewThread.boxed_clone())
-                                    .icon(IconName::Thread)
+                                    .icon(IconName::ZedAgent)
                                     .icon_color(Color::Muted)
                                     .handler({
                                         let workspace = workspace.clone();
@@ -1955,7 +1954,7 @@ impl AgentPanel {
                                     }),
                             )
                             .item(
-                                ContextMenuEntry::new("New Text Thread")
+                                ContextMenuEntry::new("Text Thread")
                                     .icon(IconName::TextThread)
                                     .icon_color(Color::Muted)
                                     .action(NewTextThread.boxed_clone())
@@ -1983,7 +1982,7 @@ impl AgentPanel {
                             .separator()
                             .header("External Agents")
                             .item(
-                                ContextMenuEntry::new("New Claude Code")
+                                ContextMenuEntry::new("Claude Code")
                                     .icon(IconName::AiClaude)
                                     .disabled(is_via_collab)
                                     .icon_color(Color::Muted)
@@ -2009,7 +2008,7 @@ impl AgentPanel {
                                     }),
                             )
                             .item(
-                                ContextMenuEntry::new("New Codex CLI")
+                                ContextMenuEntry::new("Codex CLI")
                                     .icon(IconName::AiOpenAi)
                                     .disabled(is_via_collab)
                                     .icon_color(Color::Muted)
@@ -2035,7 +2034,7 @@ impl AgentPanel {
                                     }),
                             )
                             .item(
-                                ContextMenuEntry::new("New Gemini CLI")
+                                ContextMenuEntry::new("Gemini CLI")
                                     .icon(IconName::AiGemini)
                                     .icon_color(Color::Muted)
                                     .disabled(is_via_collab)
@@ -2079,7 +2078,7 @@ impl AgentPanel {
                                 for agent_name in agent_names {
                                     let icon_path = agent_server_store_read.agent_icon(&agent_name);
                                     let mut entry =
-                                        ContextMenuEntry::new(format!("New {}", agent_name));
+                                        ContextMenuEntry::new(format!("{}", agent_name));
                                     if let Some(icon_path) = icon_path {
                                         entry = entry.custom_icon_svg(icon_path);
                                     } else {