Add story for ApplicationMenu (#13948)

This PR adds a story for the `ApplicationMenu` so it can be viewed in
isolation.

<img width="664" alt="Screenshot 2024-07-08 at 4 45 24 PM"
src="https://github.com/zed-industries/zed/assets/1486634/dca3dd32-4845-4009-b781-b4bac9ba6049">

Release Notes:

- N/A

crates/title_bar/src/title_bar.rs

@@ -4,6 +4,9 @@ mod collab;
 mod platforms;
 mod window_controls;
 
+#[cfg(feature = "stories")]
+mod stories;
+
 use crate::application_menu::ApplicationMenu;
 use crate::platforms::{platform_linux, platform_mac, platform_windows};
 use auto_update::AutoUpdateStatus;
@@ -29,6 +32,9 @@ use util::ResultExt;
 use vcs_menu::{BranchList, OpenRecent as ToggleVcsMenu};
 use workspace::{notifications::NotifyResultExt, Workspace};
 
+#[cfg(feature = "stories")]
+pub use stories::*;
+
 const MAX_PROJECT_NAME_LENGTH: usize = 40;
 const MAX_BRANCH_NAME_LENGTH: usize = 40;