refactor(ui): adopt iced color picker

Remove local Pin/PickList wrappers and the ACI grid.\nBlock viewport input behind the picker and load iced_aw glyphs.

src/ui/mod.rs

@@ -2,34 +2,6 @@
 /// Change this to scale the ribbon, layer manager rows, and property panel rows uniformly.
 pub const ROW_H: f32 = 26.0;
 
-/// Iced 0.15 separates pick-list construction from the selection callback.
-/// Keep the application's established call shape while the rest of the UI
-/// migrates independently.
-pub fn pick_list<'a, T, L, V, Message>(
-    options: L,
-    selected: Option<V>,
-    on_select: impl Fn(T) -> Message + 'a,
-) -> iced::widget::PickList<'a, T, L, V, Message>
-where
-    T: PartialEq + Clone + ToString + 'a,
-    L: std::borrow::Borrow<[T]> + 'a,
-    V: std::borrow::Borrow<T> + 'a,
-    Message: Clone + 'a,
-{
-    iced::widget::pick_list(selected, options, |value| value.to_string()).on_select(on_select)
-}
-
-/// Place `content` at fixed top-left coordinates inside a fill-sized layer.
-/// Negative coordinates clamp to the layer edge.
-pub fn pin_at<'a, Message: 'a>(
-    position: iced::Point,
-    content: impl Into<iced::Element<'a, Message>>,
-) -> iced::Element<'a, Message> {
-    iced::widget::pin(content)
-        .position(iced::Point::new(position.x.max(0.0), position.y.max(0.0)))
-        .into()
-}
-
 pub mod color_select;
 pub mod command_line;
 pub mod icons;