Avalonia app

A cross-platform emulator front-end written with Avalonia UI, shipped as two runtimes that share almost all code, including the UI:

• Browser — runs entirely in the browser via WebAssembly (no install).
• Desktop — runs natively on Windows, macOS and Linux.

Because the two runtimes share their UI, the system-specific features are documented once per system, with the small Browser-vs-Desktop differences called out inline:

• C64 in the Avalonia apps
• VIC-20 in the Avalonia apps
• Apple II Plus in the Avalonia apps
• Oric Atmos in the Avalonia apps
• Generic computer in the Avalonia apps

Runtime-specific topics:

• Desktop automation — UI automation and accessibility.
• Desktop troubleshooting — platform-specific notes.