Checklist

• I have tried ALL of the steps mentioned in the troubleshooting guide.
• I have searched for this in the issues tab.

Describe the Bug

Not only it has no percentage value displayed to the user so you're just eyeballing it every time, it doesn't seem to do absolutely anything in both extreme states. If I drag it all the way to the left or all the way to the right, both PNG and JPG images outputted by app are of exact same size which makes no sense at all.

To Reproduce

Move slider in any position and Upscayl an image. It will always produce same size JPG or PNG images regardless of the slider position.

Upscayl Version (or commit hash)

2.15.0

Platform

Windows

OS Version

Windows 11 25H2

GPU Name

Radeon RX 9070 XT

Expected Behavior

I'm assuming slider all the way to the left is 100% quality since it disappears when positioned there and all the way to the right is 0% quality. Or whatever the minimum quality is considering how interface doesn't tell me anything about my slider selection...

PNG should see at least slight difference, especially for cartoonish image that I upscaled that should compress relatively easily. I also can't seem to really notice any quality degradation in JPG which makes me believe this paired with fact that file size doesn't change, the slider does nothing at all.

Screenshots

No response

Logs

🎒 BACKEND REPORTED:  🔕 Updating Turn Off Notifications:  true
🎒 BACKEND REPORTED:  🔕 Updating Turn Off Notifications:  true
💻 System Info: {"platform":"win","release":"10.0.26200","arch":"x64","model":"AMD Ryzen 7 9800X3D 8-Core Processor","cpuCount":16,"gpu":{"active":true,"cudaComputeCapabilityMajor":0,"deviceId":65535,"deviceString":"ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver-5.0.0)","driverVendor":"SwANGLE","driverVersion":"5.0.0","gpuPreference":0,"revision":0,"subSysId":0,"vendorId":65535,"vendorString":"Google Inc. (Google)"}}