Detect orientation via LocalConfiguration and switch to a Row-based
two-column layout in landscape mode. Left column shows the title, BPM
display and pulse ring; right column shows the BPM slider, presets,
volume slider and the START/STOP button. All controls remain visible
without scrolling. Portrait layout is unchanged.
Extracted shared UI into private composables (Title, BpmDisplay,
PulseRing, BpmControls, VolumeControl, StartStopButton) to avoid
duplication between the two layout paths.
Initial project structure with manifest configured for foreground
audio service, AudioTrack-based playback, and background operation.
Includes Gradle wrapper, dependency catalog, placeholder icons,
and build instructions for Arch Linux.
