chore: Upgrade to GPUI3 (#6)

* wip: gpui3

* wip: gpui3

* chore: fix clippy

crates/ui/src/input/clear_button.rs

@@ -1,21 +0,0 @@
-use crate::{
-    button::{Button, ButtonVariants as _},
-    theme::{scale::ColorScaleStep, ActiveTheme as _},
-    Icon, IconName, Sizable as _,
-};
-use gpui::{Styled, WindowContext};
-
-pub(crate) struct ClearButton {}
-
-impl ClearButton {
-    #[allow(clippy::new_ret_no_self)]
-    pub fn new(cx: &mut WindowContext) -> Button {
-        Button::new("clean")
-            .icon(
-                Icon::new(IconName::CircleX)
-                    .text_color(cx.theme().base.step(cx, ColorScaleStep::ELEVEN)),
-            )
-            .ghost()
-            .xsmall()
-    }
-}