Toggle & Switch (#21979)

![CleanShot 2024-12-13 at 11 27
39@2x](https://github.com/user-attachments/assets/7c7828c0-c5c7-4dc6-931e-722366d4f15a)

- Adds the Switch component
- Updates `Selected`, `Selectable` -> `ToggleState`, `Toggleable`
- Adds `checkbox` and `switch` functions to align better with other
elements in our layout system.

We decided not to merge Switch and Checkbox. However, in a followup I'll
introduce a Toggle or AnyToggle enum so we can update
`CheckboxWithLabel` -> `ToggleWithLabel` as this component will work
exactly the same with either a Checkbox or a Switch.

Release Notes:

- N/A

crates/markdown_preview/src/markdown_renderer.rs

@@ -20,7 +20,7 @@ use theme::{ActiveTheme, SyntaxTheme, ThemeSettings};
 use ui::{
     h_flex, relative, tooltip_container, v_flex, Checkbox, Clickable, Color, FluentBuilder,
     IconButton, IconName, IconSize, InteractiveElement, Label, LabelCommon, LabelSize, LinkPreview,
-    Selection, StatefulInteractiveElement, StyledExt, StyledImage, ViewContext, VisibleOnHover,
+    StatefulInteractiveElement, StyledExt, StyledImage, ToggleState, ViewContext, VisibleOnHover,
     VisualContext as _,
 };
 use workspace::Workspace;
@@ -180,9 +180,9 @@ fn render_markdown_list_item(
                 Checkbox::new(
                     "checkbox",
                     if *checked {
-                        Selection::Selected
+                        ToggleState::Selected
                     } else {
-                        Selection::Unselected
+                        ToggleState::Unselected
                     },
                 )
                 .when_some(
@@ -192,8 +192,8 @@ fn render_markdown_list_item(
                             let range = range.clone();
                             move |selection, cx| {
                                 let checked = match selection {
-                                    Selection::Selected => true,
-                                    Selection::Unselected => false,
+                                    ToggleState::Selected => true,
+                                    ToggleState::Unselected => false,
                                     _ => return,
                                 };