chore: remove dead code (#878)

## 📜 Description

Follow-up for
#875

## 💡 Motivation and Context

We need to update `next` tag to make sure that changes will not be added
to subsequent releases.

Also cleaned up example code.

Ideally we should have that eslint plugin installed and activated in the
project, but maybe I'll handle it in separate PR.

## 📢 Changelog

<!-- High level overview of important changes -->
<!-- For example: fixed status bar manipulation; added new types
declarations; -->
<!-- If your changes don't affect one of platform/language below - then
remove this platform/language -->

### Docs

- removed unused style in `next` version

### JS

- removed dead code from app;

## 🤔 How Has This Been Tested?

Tested via CI.

## 📸 Screenshots (if appropriate):

<img width="1002" alt="image"
src="https://github.com/user-attachments/assets/1c64fa99-449d-43ac-8f3a-3269ae6cb643"
/>

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed

Author: kirillzyusko

FabricExample/src/components/KeyboardAnimation/styles.ts

@@ -6,11 +6,6 @@ export default StyleSheet.create({
     alignItems: "center",
     justifyContent: "space-between",
   },
-  box: {
-    width: 60,
-    height: 60,
-    marginVertical: 20,
-  },
   row: {
     flexDirection: "row",
   },

FabricExample/src/screens/Examples/KeyboardAnimation/styles.ts

@@ -6,11 +6,6 @@ export default StyleSheet.create({
     alignItems: "center",
     justifyContent: "center",
   },
-  box: {
-    width: 60,
-    height: 60,
-    marginVertical: 20,
-  },
   row: {
     flexDirection: "row",
   },

docs/docs/guides/first-animation.md

@@ -38,11 +38,6 @@ const styles = StyleSheet.create({
     alignItems: "center",
     justifyContent: "flex-end",
   },
-  box: {
-    width: 60,
-    height: 60,
-    marginVertical: 20,
-  },
   row: {
     flexDirection: "row",
   },

example/src/components/KeyboardAnimation/styles.ts

@@ -6,11 +6,6 @@ export default StyleSheet.create({
     alignItems: "center",
     justifyContent: "space-between",
   },
-  box: {
-    width: 60,
-    height: 60,
-    marginVertical: 20,
-  },
   row: {
     flexDirection: "row",
   },

example/src/screens/Examples/KeyboardAnimation/styles.ts

@@ -6,11 +6,6 @@ export default StyleSheet.create({
     alignItems: "center",
     justifyContent: "center",
   },
-  box: {
-    width: 60,
-    height: 60,
-    marginVertical: 20,
-  },
   row: {
     flexDirection: "row",
   },