Reduce navigation bar height and adapt FAB buttons position

-Reduce navigation height from 60 to 54 in order to optimize feed space.
-Fix FAB position not correct after navigation height modification.
-Fix scrollview in relays page and add space between last relay and FAB button.

frontend/Pages/ContactsFeed/index.tsx

@@ -330,7 +330,7 @@ export const ContactsFeed: React.FC = () => {
       {renderScene[tabKey]}
       {privateKey && (
         <AnimatedFAB
-          style={[styles.fab, { top: Dimensions.get('window').height - 220 }]}
+          style={[styles.fab, { top: Dimensions.get('window').height - 216 }]}
           icon='account-multiple-plus-outline'
           label='Label'
           onPress={() => bottomSheetAddContactRef.current?.open()}

frontend/Pages/ConversationsFeed/index.tsx

@@ -250,7 +250,7 @@ export const ConversationsFeed: React.FC = () => {
         </View>
       )}
       <AnimatedFAB
-        style={[styles.fab, { top: Dimensions.get('window').height - 220 }]}
+        style={[styles.fab, { top: Dimensions.get('window').height - 216 }]}
         icon='pencil-outline'
         label='Label'
         onPress={() => bottomSheetCreateRef.current?.open()}

frontend/Pages/HomeFeed/index.tsx

@@ -187,7 +187,7 @@ export const HomeFeed: React.FC<HomeFeedProps> = ({ navigation }) => {
       <View style={styles.feed}>{renderScene[tabKey]}</View>
       {privateKey && (
         <AnimatedFAB
-          style={[styles.fab, { top: Dimensions.get('window').height - 220 }]}
+          style={[styles.fab, { top: Dimensions.get('window').height - 216 }]}
           icon='pencil-outline'
           label='Label'
           onPress={() => navigate('Send')}

frontend/Pages/HomePage/index.tsx

@@ -105,7 +105,7 @@ export const HomePage: React.FC = () => {
           },
           tabBarStyle: {
             borderTopWidth: 0,
-            height: 60,
+            height: 54,
           },
           tabBarInactiveBackgroundColor: '#001C37',
           tabBarActiveBackgroundColor: theme.colors.secondaryContainer,