git: Add an onboarding and banner flow (#26518)

TODO:

- [ ] Hide the reset onboarding action (only useful for development,
uncomment:
https://github.com/zed-industries/zed/pull/26518/files#diff-f0ce01d9a3df30f60c64b6f9906c54aa0191246a58dbf5297ee321575a180879R96)
- [x] Get a designer to replace the modal background (@danilo-leal)

Release Notes:

- Added a small onboarding banner for the git launch

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>

crates/title_bar/Cargo.toml

@@ -48,6 +48,7 @@ util.workspace = true
 workspace.workspace = true
 zed_actions.workspace = true
 zeta.workspace = true
+git_ui.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 windows.workspace = true

crates/title_bar/src/title_bar.rs

@@ -18,6 +18,7 @@ use auto_update::AutoUpdateStatus;
 use call::ActiveCall;
 use client::{Client, UserStore};
 use feature_flags::{FeatureFlagAppExt, ZedPro};
+use git_ui::onboarding::GitBanner;
 use gpui::{
     actions, div, px, Action, AnyElement, App, Context, Decorations, Element, Entity,
     InteractiveElement, Interactivity, IntoElement, MouseButton, ParentElement, Render, Stateful,
@@ -126,6 +127,7 @@ pub struct TitleBar {
     application_menu: Option<Entity<ApplicationMenu>>,
     _subscriptions: Vec<Subscription>,
     zed_predict_banner: Entity<ZedPredictBanner>,
+    git_banner: Entity<GitBanner>,
 }
 
 impl Render for TitleBar {
@@ -210,6 +212,7 @@ impl Render for TitleBar {
                     )
                     .child(self.render_collaborator_list(window, cx))
                     .child(self.zed_predict_banner.clone())
+                    .child(self.git_banner.clone())
                     .child(
                         h_flex()
                             .gap_1()
@@ -313,6 +316,7 @@ impl TitleBar {
         subscriptions.push(cx.observe(&user_store, |_, _, cx| cx.notify()));
 
         let zed_predict_banner = cx.new(ZedPredictBanner::new);
+        let git_banner = cx.new(GitBanner::new);
 
         Self {
             platform_style,
@@ -326,6 +330,7 @@ impl TitleBar {
             client,
             _subscriptions: subscriptions,
             zed_predict_banner,
+            git_banner,
         }
     }