* claim: #8876
* Add optional viewport-only Kawase blur and native UI composition
* Fix vendored panel hook imports and deprecated float constant import
* Drain texture updates in the full GPU blur fixture
* Hold the blur evidence fixture camera fixed across radii
* Address blur compositor lint checks
* Share animated Render preview background with blur source
* Use resolved Design background for blur source
* Exercise blur rendering independently of software adapter policy in CI
* Use stock egui hosts instead of vendoring the full crate
* Preserve feature-window open handling with stock egui hosts
* Target the native Window in close-handling regression fixture
Nathan Dane