Tab icon size is hard-coded to 27x27pt with no way to override it

Empieza por la React Native tab options API y los dos puntos de llamada de iOS en ios/TabViewProvider.swift:60 y ios/TabViewImpl.swift:350. Comprueba cómo llegarían un navigator-level default y un per-screen override a ambas rutas de tamaño fijo, incluida la cuestión del layout de Android mencionada en la proposal. Se considera terminado cuando la API elegida permite que un tab icon use un tamaño diferente sin romper el comportamiento predeterminado.

Summary

Tab icon size is hard-coded to 27×27pt with no way to override it, which makes it impossible to give a single tab item a larger icon.

Where

Two independent call sites, both fixed:

• ios/TabViewProvider.swift:60 — private var iconSize = CGSize(width: 27, height: 27), applied to remotely-loaded icons via image.resizeImageTo(size: iconSize).
• ios/TabViewImpl.swift:350 — let iconSize = CGSize(width: 27, height: 27) inside makeTabBarItemImage, used on the experimental_bakedTintColors path.

Because remote images are resized to iconSize, supplying a larger source image has no effect.

Use case

We show the signed-in user's avatar as the Profile tab's icon (a snapshot of our own circular avatar component, handed over as a file:// PNG). Design wants that avatar rendered noticeably larger than the neighbouring glyph icons, which is a common pattern for a "you" tab — the avatar is a photo of a person rather than a symbol, so it reads better at a larger size, especially with the label hidden via tabBarLabel: ''.

At 27pt it is legible but visibly smaller than intended, and there is currently no prop, per-screen option, or imageInsets-style escape hatch to change it.

Proposal

Expose the icon size, ideally per screen so one item can differ from the rest:

<Tab.Screen
  name="Profile"
  options={{
    tabBarIcon: () => ({ uri: avatarFileUri }),
    tabBarIconSize: 34, // new
  }}
/>

A navigator-level default (iconSize on Tab.Navigator) with a per-screen override would also work for us. Happy to open a PR if you'd like it in this shape — wanted to check the preferred API first, and whether per-screen sizing raises layout concerns on Android's BottomNavigationView that aren't obvious from the iOS side.

Environment

• react-native-bottom-tabs 1.4.0 / @bottom-tabs/react-navigation 1.4.0
• React Native 0.85.3, Expo SDK 56, New Architecture, React 19.2.3
• iOS 26.5 simulator (iPhone 17 Pro), Xcode 26.6