chore: refactor the global state and improve signer (#56)

* refactor

* update

* .

* rustfmt

* .

* .

* .

* .

* .

* add document

* .

* add logout

* handle error

* chore: update gpui

* adjust timeout

crates/ui/src/avatar.rs

@@ -1,6 +1,7 @@
+use gpui::prelude::FluentBuilder;
 use gpui::{
-    div, img, prelude::FluentBuilder, px, rems, AbsoluteLength, App, Hsla, ImageSource, Img,
-    IntoElement, ParentElement, RenderOnce, Styled, StyledImage, Window,
+    div, img, px, rems, AbsoluteLength, App, Hsla, ImageSource, Img, IntoElement, ParentElement,
+    RenderOnce, Styled, StyledImage, Window,
 };
 use theme::ActiveTheme;