assistant2: Add design refinements (#27160)

Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Agus Zubiaga <hi@aguz.me>

crates/ui/src/components/disclosure.rs

@@ -11,6 +11,8 @@ pub struct Disclosure {
     selected: bool,
     on_toggle: Option<Arc<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>,
     cursor_style: CursorStyle,
+    opened_icon: IconName,
+    closed_icon: IconName,
 }
 
 impl Disclosure {
@@ -21,6 +23,8 @@ impl Disclosure {
             selected: false,
             on_toggle: None,
             cursor_style: CursorStyle::PointingHand,
+            opened_icon: IconName::ChevronDown,
+            closed_icon: IconName::ChevronRight,
         }
     }
 
@@ -31,6 +35,16 @@ impl Disclosure {
         self.on_toggle = handler.into();
         self
     }
+
+    pub fn opened_icon(mut self, icon: IconName) -> Self {
+        self.opened_icon = icon;
+        self
+    }
+
+    pub fn closed_icon(mut self, icon: IconName) -> Self {
+        self.closed_icon = icon;
+        self
+    }
 }
 
 impl Toggleable for Disclosure {
@@ -57,8 +71,8 @@ impl RenderOnce for Disclosure {
         IconButton::new(
             self.id,
             match self.is_open {
-                true => IconName::ChevronDown,
-                false => IconName::ChevronRight,
+                true => self.opened_icon,
+                false => self.closed_icon,
             },
         )
         .shape(IconButtonShape::Square)

crates/ui/src/components/icon.rs

@@ -143,6 +143,7 @@ pub enum IconName {
     ArrowUp,
     ArrowUpFromLine,
     ArrowUpRight,
+    ArrowUpRightAlt,
     AtSign,
     AudioOff,
     AudioOn,
@@ -156,6 +157,7 @@ pub enum IconName {
     Book,
     BookCopy,
     BookPlus,
+    Brain,
     CaseSensitive,
     Check,
     ChevronDown,