Add dark and tinted icons

[codebymini]

• Adds dedicated iOS app icon variants for Any, Dark, and Tinted appearances (1024.png, 1024-dark.png, 1024-tinted.png).
• Updates the AppIcon asset configuration to use the single-size iOS format.
• Removes legacy per-size PNG icon files and updates convert_icon.sh to generate the new Any/Dark/Tinted outputs plus Contents.json.

Apple now supports generating iOS/iPadOS icon variations from a single 1024×1024 asset (and explicitly supports Single Size with Any/Dark/Tinted variants), so the old manually maintained small-size PNG set is no longer required:
https://developer.apple.com/documentation/xcode/configuring-your-app-icon

[marionbarker]

Test

This works. I had to learn how to configure dark icons.

To change your iPhone to show dark icons (requires iOS 18+), long-press an empty space on your home screen until icons jiggle, tap Edit in the top-left, then select Customize. Choose Dark for dark icons, Light for light, or Auto to switch based on time. You can also choose Tinted for custom colors.

[marionbarker]

Approve by test. I would like a developer to give thumbs up for the code review.

[MikePlante1]

If I were to be super nitpicky, I'd say the black is too black compared to the rest of the dark icons... but I'm perfectly okay with merging this as is.

Nothing in the code jumped out at me as incorrect, but I'm not super familiar with a lot of that.

Default	Dark
Clear	Tinted

[MikePlante1]

I did get linting/fixems in 68 files when I built with Xcode 26.2, though.