bug: upload button color (light)

[thehairy]

Describe the bug
The upload button's color doesn't change when disabled, so you have no idea when the button is disabled and when not.

To Reproduce
Steps to reproduce the behavior:

1. Select an image to upload
2. View Button
3. Upload the image
4. *View Button

Expected behavior
The upload button should look different when disabled.

Smartphone (please complete the following information):

• Device: Samsung Galaxy S22 Ultra
• OS: Android 13
• App Version: 0.6.2