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/platform_specific/wayland/mod.rs

@@ -18,7 +18,7 @@ use cursor_icon::CursorIcon;
 use iced_futures::futures::channel::mpsc;
 use iced_graphics::{Compositor, compositor};
 use iced_runtime::core::{Vector, window};
-use raw_window_handle::{DisplayHandle, HasDisplayHandle, HasWindowHandle};
+use raw_window_handle::{HasDisplayHandle, HasWindowHandle};
 use raw_window_handle::{HasRawDisplayHandle, RawWindowHandle};
 use sctk_event::SctkEvent;
 use std::{collections::HashMap, sync::Arc};
@@ -189,12 +189,12 @@ impl WaylandSpecific {
             winit_event_sender,
             proxy,
             sender,
-            display_handle,
-            conn,
+            display_handle: _,
+            conn: _,
             surface_ids,
             modifiers,
             subsurface_state,
-            surface_subsurfaces,
+            surface_subsurfaces: _,
         } = self;
 
         match e {
@@ -237,7 +237,7 @@ impl WaylandSpecific {
         &mut self,
         keep: F,
     ) {
-        self.surface_subsurfaces.retain(|k, v| keep(*k))
+        self.surface_subsurfaces.retain(|k, _v| keep(*k))
     }
 
     pub(crate) fn clear_subsurface_list(&mut self) {
@@ -250,7 +250,7 @@ impl WaylandSpecific {
         wl_surface: &WlSurface,
     ) {
         let subsurfaces = crate::subsurface_widget::take_subsurfaces();
-        let mut entry = self.surface_subsurfaces.entry(id);
+        let entry = self.surface_subsurfaces.entry(id);
         let surface_subsurfaces = entry.or_default();
         let Some(subsurface_state) = self.subsurface_state.as_mut() else {
             return;