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

winit/src/clipboard.rs

@@ -1,7 +1,7 @@
 //! Access the clipboard.
 
 use std::sync::Mutex;
-use std::{any::Any, borrow::Cow};
+use std::borrow::Cow;
 
 use crate::Control;