yoda: cargo fix --lib across all crates — drop ~115 trivial warnings

Auto-applied suggestions (unused imports, _-prefixed unused params,
redundant mutability) on iced_core, iced_widget, iced_runtime, iced_winit,
iced_wgpu, iced_graphics, iced_tiny_skia. From 170 warnings down to 55.

Leyoda 2026 – GPLv3

core/src/widget/operation/search_id.rs

@@ -4,7 +4,7 @@ use super::Operation;
 use crate::{
     Rectangle,
     id::Id,
-    widget::operation::{Outcome, focusable::Count},
+    widget::operation::Outcome,
 };
 
 /// Produces an [`Operation`] that searches for the Id

core/src/widget/text.rs

@@ -25,13 +25,12 @@ use crate::layout;
 use crate::mouse;
 use crate::renderer;
 use crate::text::paragraph::{self, Paragraph};
-use crate::text::{self, Fragment};
+use crate::text::{self};
 use crate::widget::tree::{self, Tree};
 use crate::{
     Color, Element, Layout, Length, Pixels, Rectangle, Size, Theme, Widget,
 };
 
-use std::borrow::Cow;
 pub use text::{Alignment, Ellipsize, LineHeight, Shaping, Wrapping};
 
 /// A bunch of text.