Add user-visible output for remote operations (#25849)

This PR adds toasts for reporting success and errors from remote git
operations. This PR also adds a focus handle to notifications, in
anticipation of making them keyboard accessible.

Release Notes:

- N/A

---------

Co-authored-by: julia <julia@zed.dev>

crates/storybook/src/stories/text.rs

@@ -81,7 +81,7 @@ impl Render for TextStory {
                             "Interactive Text",
                             InteractiveText::new(
                                 "interactive",
-                                StyledText::new("Hello world, how is it going?").with_highlights(
+                                StyledText::new("Hello world, how is it going?").with_default_highlights(
                                     &window.text_style(),
                                     [
                                         (