Docs: remove RN gif and clarify nav switching

Remove the React Native introduction GIF and update the navigation selection guidance. The 'How to choose' section now emphasizes selecting the navigation mode in ABP Studio during the Mobile Framework step, removes the CLI/template-config mention, and warns that switching later requires manually adding the missing navigator package (@react-navigation/drawer or @react-navigation/bottom-tabs) and updating src/AppContainer.tsx and src/navigators/types.ts. Recommend picking the mode upfront.

docs/en/framework/ui/react-native/index.md

@@ -20,8 +20,6 @@ The ABP platform provides a basic [React Native](https://reactnative.dev/) start
 
 > The startup template UI is built with **[NativeWind v4](https://www.nativewind.dev/)** (Tailwind CSS for React Native) on top of a shadcn-inspired neutral palette, with full **light/dark mode** support. See [Styling with NativeWind](styling-with-nativewind.md) for the styling system reference.
 
-![React Native gif](../../../images/react-native-introduction.gif)
-
 ## How to Prepare Development Environment
 
 Please follow the steps below to prepare your development environment for React Native.
@@ -164,7 +162,7 @@ The startup template ships with **two navigation styles**, switchable when the p
 
 Each top-level destination is its own native stack (`@react-navigation/native-stack`), so deeper navigation inside a tab/drawer item keeps that area's history isolated. Both modes share the same screens — only the entry surface and the auth flow placement change.
 
-> **How to choose:** The mode is selected in **ABP Studio** during the *Mobile Framework* step (or via the `navigation_type` template config when using the CLI). To switch later, you can manually replace `BottomTabNavigator` with `DrawerNavigator` (or vice versa) in `src/AppContainer.tsx` and adjust `src/navigators/types.ts` accordingly.
+> **How to choose:** The mode is selected in **ABP Studio** during the *Mobile Framework* step. Switching modes after the project is generated is not a one-line change — you would need to add the missing navigator (and its `@react-navigation/drawer` or `@react-navigation/bottom-tabs` dependency) manually, then update `src/AppContainer.tsx` and `src/navigators/types.ts` to match. Pick the mode upfront when possible.
 
 ### Bottom Tab Navigation (default)