[BUG] Volume Control slider won't work on Linux

[AverageDood]

Describe the bug
Volume control displays no data on Linux according to the phone app, and is always set to minimum according to the PC app

To Reproduce
Steps to reproduce the behavior:

1. Add a Volume Control button to the board and extend to liking
2. Connect the app and choose the corresponding board
3. See error

Expected behavior
Volume Control button should display current system volume from the system's default output device and allow you to adjust it

Screenshots
Deckboard PRO app on Android device

Deckboard app on Linux PC

Server App (please complete the following information):

• OS: Linux (Arch Linux)
• Version: 3.0.9

Client App (please complete the following information):

• OS: Android (tested on 8, 11 and 14, rendering the Android version irrelevant)
• Version: 3.1.5

Required files

• database.db (located in C:\Users%USER%\deckboard)
  Linked to a Google Drive file, as Github reports .db files as "not supported"
  https://drive.google.com/file/d/1J9DeYXzbyQG4o2WKDYNrN2BM7tdClr63/view?usp=sharing

• log.log (located in located in C:\Users%USER%\AppData\Roaming\Deckboard)
  deckboard_log_161125172520.log

Additional context
Tested on Arch Linux using KDE Plasma 6, Wayland and Pipewire. Two volume outputs exist on my device, being jack headphones and HDMI output.