Make a single re-usable banner component (#27412)

Release Notes:

- Fixed an issue where both the predict edit and git onboarding banners
would both show at the same time.

crates/zed/Cargo.toml

@@ -122,6 +122,7 @@ theme.workspace = true
 theme_extension.workspace = true
 theme_selector.workspace = true
 time.workspace = true
+title_bar.workspace = true
 toolchain_selector.workspace = true
 ui.workspace = true
 ui_prompt.workspace = true

crates/zed/src/zed.rs

@@ -65,12 +65,12 @@ use uuid::Uuid;
 use vim_mode_setting::VimModeSetting;
 use welcome::{BaseKeymap, MultibufferHint};
 use workspace::notifications::{dismiss_app_notification, show_app_notification, NotificationId};
-use workspace::CloseIntent;
 use workspace::{
     create_and_open_local_file, notifications::simple_message_notification::MessageNotification,
     open_new, AppState, NewFile, NewWindow, OpenLog, Toast, Workspace, WorkspaceSettings,
 };
 use workspace::{notifications::DetachAndPromptErr, Pane};
+use workspace::{CloseIntent, RestoreBanner};
 use zed_actions::{
     OpenAccountSettings, OpenBrowser, OpenServerSettings, OpenSettings, OpenZedUrl, Quit,
 };
@@ -105,6 +105,8 @@ pub fn init(cx: &mut App) {
     cx.on_action(|_: &ShowAll, cx| cx.unhide_other_apps());
     cx.on_action(quit);
 
+    cx.on_action(|_: &RestoreBanner, cx| title_bar::restore_banner(cx));
+
     if ReleaseChannel::global(cx) == ReleaseChannel::Dev {
         cx.on_action(test_panic);
     }