zeta: Onboarding and title bar banner (#23797)

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo <danilo@zed.dev>
Co-authored-by: João Marcos <joao@zed.dev>

crates/ui/src/components/context_menu.rs

@@ -64,6 +64,11 @@ impl ContextMenuEntry {
         }
     }
 
+    pub fn toggleable(mut self, toggle_position: IconPosition, toggled: bool) -> Self {
+        self.toggle = Some((toggle_position, toggled));
+        self
+    }
+
     pub fn icon(mut self, icon: IconName) -> Self {
         self.icon = Some(icon);
         self