Release v0.5.3 — preview fix, results never lost, portable build · pwilkin/trellis.cpp

v0.5.3 — preview fix, results never lost, portable build

3D preview works again. The packaged app's CSP blocked model-viewer from
fetching the model (a blob: URL), so the preview failed with
Cannot read properties of undefined (reading 'scene') — broken since v0.5.0
(only in the packaged app, so it slipped past browser/dev testing). Fixed by
allowing blob:/data: in connect-src.
A generation can no longer be lost to a preview error. Results are now
written to the gallery and the output folder before the 3D preview is
rendered (and the viewer load has a timeout so it can't hang). Previously a
WebGL/preview failure discarded a successful generation.

Portable, no-install build. trellis-studio-windows-x64-portable.zip and
trellis-studio-linux-x86_64-portable.tar.gz — unzip anywhere and run in place.
It keeps config + generated GLBs in ./data/ next to the app and auto-detects a
./runtime/ server + ./models/ weights layout, writing nothing to the system.

Server bundles + app installers/archives attach below once CI finishes building.