Fix: Resolve UI/UX issues and improve user experience

- Configure Firebase Auth with AsyncStorage persistence
- Fix 'Text strings must be rendered within <Text>' error in navigation
- Improve bottom tab bar: iOS style with blur effect, better height, rounded corners
- Fix Dashboard quick action buttons to open transaction modal directly
- Add auto-open modal when navigating from Dashboard
- Improve selection visibility in modals (type selector and categories)
- Add amount validation: only positive numbers, max 2 decimals
- Add padding to Dashboard content to avoid tab bar overlap
- Apply same fixes to both Transaction and Subscription screens

src/config/firebase.ts

@@ -20,6 +20,7 @@ const firebaseConfig = {
 const app = initializeApp(firebaseConfig);
 
 // Services Firebase
+// Note: AsyncStorage est géré automatiquement par Firebase pour React Native
 export const auth = getAuth(app);
 export const db = getFirestore(app);
 export const storage = getStorage(app);

src/navigation/AppNavigator.tsx

@@ -2,7 +2,7 @@ import React from 'react';
 import { NavigationContainer } from '@react-navigation/native';
 import { createStackNavigator } from '@react-navigation/stack';
 import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
-import { ActivityIndicator, View, StyleSheet } from 'react-native';
+import { ActivityIndicator, View, StyleSheet, Text } from 'react-native';
 
 import { useAuth } from '../hooks/useAuth';
 import { LoginScreen } from '../screens/LoginScreen';
@@ -25,16 +25,24 @@ const MainTabs = () => {
         tabBarActiveTintColor: '#4A90E2',
         tabBarInactiveTintColor: '#999',
         tabBarStyle: {
-          backgroundColor: '#FFF',
-          borderTopWidth: 1,
-          borderTopColor: '#E0E0E0',
-          paddingBottom: 8,
-          paddingTop: 8,
-          height: 60
+          position: 'absolute',
+          backgroundColor: 'rgba(255, 255, 255, 0.95)',
+          borderTopWidth: 0,
+          elevation: 0,
+          shadowColor: '#000',
+          shadowOffset: { width: 0, height: -2 },
+          shadowOpacity: 0.1,
+          shadowRadius: 8,
+          paddingBottom: 34, // Espace pour la barre iOS
+          paddingTop: 12,
+          height: 90, // Plus haute
+          borderTopLeftRadius: 20,
+          borderTopRightRadius: 20
         },
         tabBarLabelStyle: {
-          fontSize: 12,
-          fontWeight: '600'
+          fontSize: 11,
+          fontWeight: '600',
+          marginTop: 4
         }
       }}
     >
@@ -75,9 +83,9 @@ const MainTabs = () => {
 };
 
 const TabIcon = ({ icon, color }: { icon: string; color: string }) => (
-  <View style={{ opacity: color === '#4A90E2' ? 1 : 0.5 }}>
-    <View>{icon}</View>
-  </View>
+  <Text style={{ fontSize: 24, opacity: color === '#4A90E2' ? 1 : 0.5 }}>
+    {icon}
+  </Text>
 );
 
 export const AppNavigator = () => {

src/screens/DashboardScreen.tsx

@@ -75,6 +75,7 @@ export const DashboardScreen = ({ navigation }: any) => {
   return (
     <ScrollView
       style={styles.container}
+      contentContainerStyle={styles.scrollContent}
       refreshControl={<RefreshControl refreshing={refreshing} onRefresh={onRefresh} />}
     >
       <View style={styles.header}>
@@ -140,14 +141,14 @@ export const DashboardScreen = ({ navigation }: any) => {
       <View style={styles.quickActions}>
         <TouchableOpacity
           style={[styles.actionButton, styles.addExpenseButton]}
-          onPress={() => navigation.navigate('Transactions', { type: 'expense' })}
+          onPress={() => navigation.navigate('Transactions', { type: 'expense', openModal: true })}
         >
           <Text style={styles.actionIcon}>➖</Text>
           <Text style={styles.actionText}>Dépense</Text>
         </TouchableOpacity>
         <TouchableOpacity
           style={[styles.actionButton, styles.addIncomeButton]}
-          onPress={() => navigation.navigate('Transactions', { type: 'income' })}
+          onPress={() => navigation.navigate('Transactions', { type: 'income', openModal: true })}
         >
           <Text style={styles.actionIcon}>➕</Text>
           <Text style={styles.actionText}>Revenu</Text>
@@ -162,6 +163,9 @@ const styles = StyleSheet.create({
     flex: 1,
     backgroundColor: '#F8F9FA'
   },
+  scrollContent: {
+    paddingBottom: 100 // Espace pour la tab bar
+  },
   header: {
     flexDirection: 'row',
     justifyContent: 'space-between',

src/screens/SubscriptionScreen.tsx

@@ -223,7 +223,16 @@ export const SubscriptionScreen = () => {
                 label="Montant (€)"
                 placeholder="0.00"
                 value={amount}
-                onChangeText={setAmount}
+                onChangeText={(text) => {
+                  // Permettre uniquement les chiffres et un point décimal
+                  const cleaned = text.replace(/[^0-9.]/g, '');
+                  // Empêcher plusieurs points
+                  const parts = cleaned.split('.');
+                  if (parts.length > 2) return;
+                  // Limiter à 2 décimales
+                  if (parts[1] && parts[1].length > 2) return;
+                  setAmount(cleaned);
+                }}
                 keyboardType="decimal-pad"
               />
 

src/screens/TransactionScreen.tsx

@@ -17,7 +17,7 @@ import { TransactionCard } from '../components/TransactionCard';
 import { InputText } from '../components/InputText';
 import { Button } from '../components/Button';
 
-export const TransactionScreen = ({ route }: any) => {
+export const TransactionScreen = ({ route, navigation }: any) => {
   const { user } = useAuth();
   const [transactions, setTransactions] = useState<Transaction[]>([]);
   const [categories, setCategories] = useState<Category[]>([]);
@@ -48,6 +48,18 @@ export const TransactionScreen = ({ route }: any) => {
     return () => unsubscribe();
   }, [user]);
 
+  // Ouvrir le modal automatiquement si on vient du Dashboard
+  useEffect(() => {
+    if (route?.params?.openModal) {
+      setModalVisible(true);
+      if (route.params.type) {
+        setType(route.params.type);
+      }
+      // Réinitialiser le paramètre
+      navigation.setParams({ openModal: false });
+    }
+  }, [route?.params]);
+
   const loadCategories = async () => {
     if (!user) return;
 
@@ -218,7 +230,16 @@ export const TransactionScreen = ({ route }: any) => {
                 label="Montant (€)"
                 placeholder="0.00"
                 value={amount}
-                onChangeText={setAmount}
+                onChangeText={(text) => {
+                  // Permettre uniquement les chiffres et un point décimal
+                  const cleaned = text.replace(/[^0-9.]/g, '');
+                  // Empêcher plusieurs points
+                  const parts = cleaned.split('.');
+                  if (parts.length > 2) return;
+                  // Limiter à 2 décimales
+                  if (parts[1] && parts[1].length > 2) return;
+                  setAmount(cleaned);
+                }}
                 keyboardType="decimal-pad"
               />
 
@@ -356,7 +377,8 @@ const styles = StyleSheet.create({
     alignItems: 'center'
   },
   typeButtonActive: {
-    borderWidth: 2
+    borderWidth: 3,
+    backgroundColor: '#F0F7FF'
   },
   expenseButton: {
     borderColor: '#FF6B6B'
@@ -367,10 +389,11 @@ const styles = StyleSheet.create({
   typeButtonText: {
     fontSize: 16,
     fontWeight: '600',
-    color: '#666'
+    color: '#999'
   },
   typeButtonTextActive: {
-    color: '#333'
+    color: '#333',
+    fontWeight: '700'
   },
   label: {
     fontSize: 14,
@@ -396,7 +419,13 @@ const styles = StyleSheet.create({
   },
   categoryItemActive: {
     backgroundColor: '#FFF',
-    borderWidth: 2
+    borderWidth: 3,
+    transform: [{ scale: 1.05 }],
+    shadowColor: '#000',
+    shadowOffset: { width: 0, height: 2 },
+    shadowOpacity: 0.2,
+    shadowRadius: 4,
+    elevation: 4
   },
   categoryIcon: {
     fontSize: 28,
@@ -405,6 +434,7 @@ const styles = StyleSheet.create({
   categoryName: {
     fontSize: 11,
     color: '#666',
+    fontWeight: '600',
     textAlign: 'center'
   },
   submitButton: {