Created attachment 175272 [details]
Example of the issue next to the cursor

SUMMARY

Steam's builtin tray icon, $STEAMDIR/public/steam_tray_mono.png, is coloured white and is hardly visible against a white system tray. This can be fixed by adding data to the Breeze icons.

STEPS TO REPRODUCE
1. Change the Plasma theme to Breeze (not Breeze Dark)
2. Launch Steam
3. Enable a system tray widget and Steam in that widget if not configured already

OBSERVED RESULT
The icon is hardly visible

EXPECTED RESULT
The icon is visible and either has a black version or uses the already included steam logo

SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Operating System: Fedora Linux 40
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2
Kernel Version: 6.11.4-201.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630

ADDITIONAL INFORMATION
Adding a flle in ~/.local/share/icons called steam_tray_mono.png fixes the issue. For example, you can reproduce my working configuration:

```
$ cp /usr/share/icons/breeze/apps/48/steam.svg ~/.local/share/icons/steam_tray_mono.svg
$ ln -s steam_tray_mono.svg ~/.local/share/icons/steam_tray_mono.png
```

Which copies the svg from Breeze to the user's icon directory then links steam_tray_mono.png to that file.

My suggestion is to emulate this by including a symliink called steam_tray_mono.png to steam.svg, like how there's a symlink called com.valvesoftware.Steam that is just a link to the main file. Note that the file extension matters in this case for some reason or another (usually it's agnostic in the Freedesktop specs?)