fix: migrate source code to wgpu 29.0.0 API

[Copilot]

Multiple breaking API changes in wgpu 29.0.0 caused build failures across the workspace. This PR updates all call sites to match the new API.

Dependency

• Bumped wgpu-core and wgpu-types from 28.0 → 29.0 in Cargo.toml (eliminates version conflict with wgpu 29's own transitive deps)

Breaking API changes addressed

• Instance::new now takes owned InstanceDescriptor (not &T); InstanceDescriptor no longer implements Default — replaced ..Default::default() with ..wgpu::InstanceDescriptor::new_without_display_handle()

• get_current_texture returns CurrentSurfaceTexture enum instead of Result<SurfaceTexture, SurfaceError>. Introduced a local RenderError enum mapping Lost/Outdated → reconfigure and Timeout/Occluded/Validation → skip frame:

  match self.surface.get_current_texture() {
      CurrentSurfaceTexture::Success(t) | CurrentSurfaceTexture::Suboptimal(t) => t,
      CurrentSurfaceTexture::Outdated | CurrentSurfaceTexture::Lost =>
          return Err(RenderError::SurfaceReconfigure),
      CurrentSurfaceTexture::Timeout | CurrentSurfaceTexture::Occluded
      | CurrentSurfaceTexture::Validation => return Ok(()),
  }

• PipelineLayoutDescriptor::bind_group_layouts type changed from &[&BindGroupLayout] → &[Option<&BindGroupLayout>]

• DepthStencilState fields depth_write_enabled and depth_compare are now Option<bool> and Option<CompareFunction> respectively

• Features::SHADER_PRIMITIVE_INDEX renamed to Features::PRIMITIVE_INDEX

• Limits: max_uniform_buffer_binding_size and max_storage_buffer_binding_size changed from u32 → u64; max_inter_stage_shader_components renamed to max_inter_stage_shader_variables

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