Introduce a browserPreview mode (isBrowserPreview) with adjusted viewport scaling and CSS (.phone-stage--browser-preview) and update related contract tests. Allow apiBase via URL params in nui utils so the dev build can call a local browser API base. Replace many SVG app icons with WebP (and update imports), swap crypto header PNG to WebP, and add a demo wallpaper image. Testserver now installs demo apps and configures a demo wallpaper; smoke tests updated to assert these browser-demo conditions.
Replaces the map atlas and several WebP app/weather icon assets with updated binaries and removes the old feather.svg icon (iconography migrated to WebP). Pure asset refresh / visual update; no code changes. Run the frontend build (build_frontend.bat) if you need to verify the updated NUI bundle.