Better wallpaper/message bubbles when in light mode

[NuclearKev]

Is your feature request related to a problem? Please describe. Kind of. When trying to use trifa on an e-ink tablet it's nearly impossible to see.

Describe the solution you'd like I would like there to be a more white background and have the chat bubbles be lighter as well. The sent message bubbles tend to be worse than the received on the e-ink.

Your system information:

• TRIfA Version: 1.0.255
• App from Google-Play / F-Droid / Github-Releases / other: F-Droid
• Android OS Version: Android 12 / 11
• Device: Mudita Kompakt / Boox Poke5

Describe alternatives you've considered I tend to just use aTox on my e-ink as it's too difficult to read my own messages.

Additional context Add any other context or screenshots about the feature request here.