Hardcoded cursor size in gamescope-session file results in oversized cursor on high-resolution internal panels

[matte-schwartz]

Your system information

• Steam client version: 1764106918
• SteamOS version: 20251124.1000
• Opted into Steam client beta?: Yes
• Opted into SteamOS beta?: Yes
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

When using gamescope-session on my ROG Flow Z13, which has a 2560x1600p internal display panel, the cursor size looks overly large and pixelated. The only way to adjust this is by unlocking the rootfs and changing the gamescope-session file directly, which is not something we want to direct users to do.