Linux test build for #30, based on v1.1.0.
The built-in file browser is enabled automatically for disc/SBI selection, custom BIOS selection, and installing .psxmod packages. Download the AppImage and launch it normally. No environment variables, command-line flags, or desktop file-picker packages are needed for these buttons.
Existing saves and settings use the same location as v1.1.0. This prerelease contains the same game/runtime baseline and bundled original-disc AOT cache coverage as v1.1.0.
Validation: Linux build, AppImage layout checks, default-picker launch test, and graphical picker checks in Ubuntu WSL. Debian 13/Openbox testing is requested.