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  or an occluded window: reconfigure when the surface is outdated, lost or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>

core/src/render/mod.rs

@@ -186,8 +186,8 @@ impl UiRenderNode {
         for source in &registry.sources()[self.primitives.len()..] {
             let render = (source.render)(device, queue);
             let data_layout = Self::data_layout(device, source.stride);
-            let mut groups = vec![&self.shared_layout, &data_layout];
-            groups.extend(render.layout());
+            let mut groups = vec![Some(&self.shared_layout), Some(&data_layout)];
+            groups.extend(render.layout().map(Some));
             let layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
                 label: Some(source.label),
                 bind_group_layouts: &groups,
@@ -219,7 +219,7 @@ impl UiRenderNode {
             vertex: VertexState {
                 module: &module,
                 entry_point: Some("vs_main"),
-                buffers: &[PrimitiveInstance::desc()],
+                buffers: &[Some(PrimitiveInstance::desc())],
                 compilation_options: Default::default(),
             },
             fragment: Some(FragmentState {