Bug Fixes

• Fix crash when opening MIDI output device settings (devices with no name returned None, causing ValueError)
• Add fallback device naming chain: PROPERTY_NAME -> PROPERTY_PRODUCT -> PROPERTY_MANUFACTURER -> generic label
• Wrap MIDI settings popup in error handling to prevent crashes
• Fix MIDI output device popup layout (buttons were overlapping in a tiny strip)
• Fix selected device state not shown in Android MIDI device picker

Improvements

• Add unit test infrastructure (pytest) and CI test job
• Improve error logging in MIDI device config changes