* fix(app): adjust CSP settings for skin manager to work
* tweak: allow current Tauri scheme in CSP
* tweak: remove references to invalid `sunny.png` texture in skin models
These were causing load errors in production app builds.
* tweak: use proper URL imports for skin models
This fixes importing these models in production builds of the app.
* chore(app-frontend): use more proper import style for glTF assets
* tweak: use proper URL imports for skin models in more places