shortcuts: Steam deck hardware volume buttons and media keys are not mapped

Hi,

I notice the media volume controls do not work. I think its not device specific because my deck and trackpoint have media keys. These keys do not work on both devices.

Device:           AT Translated Set 2 keyboard
Kernel:           /dev/input/event0
Group:            8
Seat:             seat0, default
Capabilities:     keyboard 
Tap-to-click:     n/a
Tap-and-drag:     n/a
Tap drag lock:    n/a
Left-handed:      n/a
Nat.scrolling:    n/a
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   none
Click methods:    none
Disable-w-typing: n/a
Disable-w-trackpointing: n/a
Accel profiles:   n/a
Rotation:         0.0

event0   KEYBOARD_KEY            +25.596s      KEY_VOLUMEDOWN (114) pressed
 event0   KEYBOARD_KEY            +25.811s      KEY_VOLUMEDOWN (114) released
 event0   KEYBOARD_KEY            +26.314s      KEY_VOLUMEUP (115) pressed
 event0   KEYBOARD_KEY            +26.510s      KEY_VOLUMEUP (115) released

 zypper info plasma6-mobile
Repository 'packman-essentials' is out-of-date. You can run 'zypper refresh' as root to update it.
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Information for package plasma6-mobile:
---------------------------------------
Repository     : KDE Frameworks and Plasma (openSUSE_Tumbleweed)
Name           : plasma6-mobile
Version        : 6.0.1-kf.1.1
Arch           : x86_64
Vendor         : obs://build.opensuse.org/KDE
Installed Size : 5.8 MiB
Installed      : Yes
Status         : out-of-date (version 6.0.0-kf.2.1 installed)
Source package : plasma6-mobile-6.0.1-kf.1.1.src
Upstream URL   : https://www.kde.org/
Summary        : Plasma shell for mobile devices
Description    : 
    Plasma shell for mobile devices.