Add checkboxes and their stories

crates/theme2/src/colors.rs

@@ -54,7 +54,9 @@ pub struct ThemeColors {
     pub border: Hsla,
     pub border_variant: Hsla,
     pub border_focused: Hsla,
+    pub border_selected: Hsla,
     pub border_transparent: Hsla,
+    pub border_disabled: Hsla,
     pub elevated_surface: Hsla,
     pub surface: Hsla,
     pub background: Hsla,

crates/theme2/src/default_colors.rs

@@ -205,6 +205,8 @@ impl ThemeColors {
             border: neutral().light().step_6(),
             border_variant: neutral().light().step_5(),
             border_focused: blue().light().step_5(),
+            border_disabled: neutral().light().step_3(),
+            border_selected: blue().light().step_5(),
             border_transparent: system.transparent,
             elevated_surface: neutral().light().step_2(),
             surface: neutral().light().step_2(),
@@ -250,6 +252,8 @@ impl ThemeColors {
             border: neutral().dark().step_6(),
             border_variant: neutral().dark().step_5(),
             border_focused: blue().dark().step_5(),
+            border_disabled: neutral().dark().step_3(),
+            border_selected: blue().dark().step_5(),
             border_transparent: system.transparent,
             elevated_surface: neutral().dark().step_2(),
             surface: neutral().dark().step_2(),