icons: add icons for headphones and headset devices

Gergely Imrehrequested to merge
imrehg/xfce4-power-manager:headphones-icon into master

Previously Bluetooth headphones and headsets showed up as "battery" by default, and with the non-helpful default battery warning icon.

I've tested this changes on ArchLinux, with a Bose NC700 bluetooth headphones: the HEADPHONES change. The HEADSET branch I couldn't test yet (no hardware at hand), but looking at finding some other ways (either hardware to test or mocking things).

Screenshots of the status before

Screenshot_2026-06-24_12-34-46

Screenshot_2026-06-23_12-38-15

Screenshots of the Power Manager settings & panel with this changes

Screenshot_2026-06-24_12-34-16

Screenshot_2026-06-24_12-39-06.png

Edited by Gergely Imreh

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