feat: initial release

Fixed volume steps for Bluetooth audio devices on PipeWire. Corrects the
coarse internal volume grid of devices such as AirPods Pro (16 AVRCP steps,
6.25 % per swipe) to the desktop's own step size.

The device grid is measured per device; the desktop step size is read from
Plasma. English and German messages.

.gitignore

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+__pycache__/
+*.pyc