Build on wgpu 30

Two majors, and the renderer is under everything else that is left to
extract, so it goes before the slices that would otherwise be written twice.
`image` 0.25.6 -> 0.25.10 rides along; `winit` stays on 0.30.12, since 0.31
is only a prerelease.

What the API asked for:

- An instance now takes the display it will present on, and GLES on Wayland
  needs it -- so the window the surface is made from is handed over with it.
- `get_current_texture` returns a `CurrentSurfaceTexture` rather than a
  `Result`, which replaces an `unwrap` that would have panicked on a resize
  or an occluded window: reconfigure when the surface is outdated, lost or
  suboptimal, and skip the frame when there is nothing to draw into.
- Presenting moved to the queue, after `pre_present_notify` as before.
- Bind group layouts and vertex buffer layouts are sparse now, so a pipeline
  states `Some(layout)` per slot.

Verified with the three render checks and `tests/draw_cost.rs`: identical
pictures, and 33.6/167/587/2855 us per frame at 8/64/256/1024 layers against
33.3/161/588/2903 on wgpu 28.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/draw_cost.rs

@@ -37,13 +37,13 @@ const BATCHES: u32 = 8;
 fn gpu() -> Option<(Device, Queue)> {
     // Probed rather than assumed: this machine's Vulkan device comes and goes,
     // and GL is what is left when it is gone.
-    let all = Instance::new(&InstanceDescriptor::default());
+    let all = Instance::new(InstanceDescriptor::new_without_display_handle());
     let instance = match pollster::block_on(all.request_adapter(&RequestAdapterOptions::default()))
     {
         Ok(_) => all,
-        Err(_) => Instance::new(&InstanceDescriptor {
+        Err(_) => Instance::new(InstanceDescriptor {
             backends: Backends::GL,
-            ..Default::default()
+            ..InstanceDescriptor::new_without_display_handle()
         }),
     };
     // Leaked rather than dropped: see the note at the top of the file.
@@ -58,6 +58,7 @@ fn config(format: TextureFormat) -> SurfaceConfiguration {
     SurfaceConfiguration {
         usage: TextureUsages::RENDER_ATTACHMENT,
         format,
+        color_space: SurfaceColorSpace::Auto,
         width: SIZE,
         height: SIZE,
         present_mode: PresentMode::Fifo,