perf: keep heavy work off UI thread

crates/iced_wgpu/OCS_PATCH.md

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+# OpenCADStudio patch
+
+This directory vendors `iced_wgpu` 0.14.0 under its MIT license.
+
+OpenCADStudio changes only the WASM device-limit selection in
+`src/window/compositor.rs`: Browser WebGPU first requests normal WebGPU limits
+so storage-buffer pipelines are available, then falls back to WebGL2 limits.
+An actual WebGL adapter continues to request WebGL2 limits directly.