Detect app icons for iOS and Android projects

[nabettu]

Many projects in T3 Code are iOS or Android apps. They usually have no web favicon, so they show a letter monogram even though the repository already contains an app icon.

Before	After

Proposal: extend automatic icon detection as a last resort, the way #17149 did for .icns:

1. The icon a root Expo app.json declares.
2. An AppIcon set in a nearby Xcode asset catalog.
3. A flattened Android ic_launcher image.

Projects that already resolve an icon keep it. There is no new setting, and the change is server-only, so web, desktop, and mobile all get it through the existing asset route.

The one cost is a bounded directory search for asset catalogs on lookups that find nothing else: three levels deep, at most 256 reads, skipping dependency folders.

I opened #27919 with an implementation, but it has no maintainer approval. Is this direction acceptable, and is the bounded search the right trade-off versus fixed paths or iconPath in t3.json?

[Aayush9029]

+1, and please also detect Icon Composer packages (AppIcon.icon, Xcode 26 and later).

Most of my iOS and macOS repos have no AppIcon.appiconset. They have only an AppIcon.icon folder, which the proposal in #27919 does not find. Each project shows a monogram.

The package is a folder with icon.json and layer images, so it needs a render step. Xcode includes a CLI that renders it:

ictool AppIcon.icon --export-image --output-file icon.png \
  --platform iOS --rendition Default --width 256 --height 256 --scale 1

ictool is at Xcode.app/Contents/Applications/Icon Composer.app/Contents/Executables/ictool. Its output is masked and ready for the sidebar.

My workaround now is a .t3/icon.png export and "iconPath": ".t3/icon.png" in t3.json for each repo. Built-in detection would remove that step.