- Add file:// URL handling to AssetFilesInterface in kernel.cpp
- Update home.lua to use file:// prefix for absolute filesystem paths
- Add file:// URL handling to desktop file interface for consistency
This fixes RmlUi stripping the leading slash from absolute paths
when resolving img src URLs relative to the document base.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>