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/assistant/src/inline_assistant.rs

@@ -1534,7 +1534,7 @@ impl Render for PromptEditor {
                                 v_flex()
                                     .child(
                                         IconButton::new("rate-limit-error", IconName::XCircle)
-                                            .selected(self.show_rate_limit_notice)
+                                            .toggle_state(self.show_rate_limit_notice)
                                             .shape(IconButtonShape::Square)
                                             .icon_size(IconSize::Small)
                                             .on_click(cx.listener(Self::toggle_rate_limit_notice)),
@@ -2133,15 +2133,15 @@ impl PromptEditor {
                             "dont-show-again",
                             Label::new("Don't show again"),
                             if dismissed_rate_limit_notice() {
-                                ui::Selection::Selected
+                                ui::ToggleState::Selected
                             } else {
-                                ui::Selection::Unselected
+                                ui::ToggleState::Unselected
                             },
                             |selection, cx| {
                                 let is_dismissed = match selection {
-                                    ui::Selection::Unselected => false,
-                                    ui::Selection::Indeterminate => return,
-                                    ui::Selection::Selected => true,
+                                    ui::ToggleState::Unselected => false,
+                                    ui::ToggleState::Indeterminate => return,
+                                    ui::ToggleState::Selected => true,
                                 };
 
                                 set_rate_limit_notice_dismissed(is_dismissed, cx)