fix: allow blob: urls in worldLoader to enable local file dropping

fix: syntax error escaped backticks again in worldLoader

feat: add developer P key logger and remove PlacementEditor

fix: remove escaped backticks causing syntax error

fix: use dynamic displayName for external URLs

feat: implement concurrent chunked upload and JYSM prefix URL routing

fix: revert proxy and use nocache to bypass worker CORS cache bug

fix: proxy external models to bypass worker CORS and HF redirects

fix: change url param to model to avoid vite intercept

Initial commit: SparkSplat with proper UTF-8 LFS