Solid black (optional) for background

[Korb]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I optionally donated to support the Fossify mission.

Feature description

Gallery currently uses the non-black color #171C1F as its dark theme background.

Why do you want this feature?

Here's how application developers argue for using #000 as a background color:

Google Android 14:

Dark Theme Screen / On some screens, Dark theme will use a solid black background which will help extend your battery life. After scheduling, Dark theme will be enabled when your screen is off.

Catima:

Pure black background for dark theme (reduces battery usage on OLED displays).

F-Droid:

Use pure black background in dark theme. Recommended only for OLED screens.

Additional information

No response

[Aga-C]

We already have this raised as an enhancement for all Fossify apps: FossifyOrg/General-Discussion#109.