Added basic styling for checkboxes, yay

Co-authored-by: Max <max@zed.dev>

crates/theme/src/theme.rs

@@ -860,9 +860,10 @@ pub struct WelcomeStyle {
 pub struct CheckboxStyle {
     pub width: f32,
     pub height: f32,
-    pub unchecked: ContainerStyle,
+    pub default: ContainerStyle,
     pub checked: ContainerStyle,
     pub hovered: ContainerStyle,
+    pub hovered_and_checked: ContainerStyle,
 }
 
 #[derive(Clone, Deserialize, Default)]

crates/welcome/src/welcome.rs

@@ -126,11 +126,17 @@ impl WelcomePage {
                 .with_height(style.height)
                 .contained()
                 .with_style(if checked {
-                    style.checked
-                } else if state.hovered() {
-                    style.hovered
+                    if state.hovered() {
+                        style.hovered_and_checked
+                    } else {
+                        style.checked
+                    }
                 } else {
-                    style.unchecked
+                    if state.hovered() {
+                        style.hovered
+                    } else {
+                        style.default
+                    }
                 })
                 .boxed()
         })