feat: Implement document management features

- Added a new DocumentsScreen for managing user documents with search and date filtering capabilities.
- Created AddDocumentModal for uploading documents with file selection and custom title options.
- Introduced SiteDocumentsScreen to display documents related to specific construction sites.
- Implemented SitesScreen for listing construction sites with search functionality.
- Updated ProfileScreen to link to the new DocumentsScreen.
- Refactored RangePickerModal for selecting date ranges in document filtering.
- Improved date formatting utilities for better timestamp handling.
- Added necessary API calls for document and site management.
- Updated types to reflect changes in document structure and site information.
- Added expo-document-picker dependency for document selection functionality.

app/login.tsx

@@ -1,16 +1,6 @@
 import React, { useState, useContext } from 'react';
 import { Eye, EyeOff, Lock, LogIn, Mail } from 'lucide-react-native';
-import {
-    KeyboardAvoidingView,
-    Platform,
-    ScrollView,
-    Text,
-    TextInput,
-    TouchableOpacity,
-    View,
-    Image,
-    Alert
-} from 'react-native';
+import { KeyboardAvoidingView, Platform, ScrollView, Text, TextInput, TouchableOpacity, View, Image, Alert } from 'react-native';
 import { AuthContext } from '@/utils/authContext';
 import api from '@/utils/api';
 
@@ -21,6 +11,7 @@ export default function LoginScreen() {
     const [showPassword, setShowPassword] = useState(false);
     const [isLoading, setIsLoading] = useState(false);
 
+    // TODO: Riscrivere funzione per migliorare leggibilità e gestione errori
     const handleLogin = async () => {
         // TODO: Implementa toast o messaggio di errore più user-friendly
         if (!username || !password) {
@@ -31,9 +22,10 @@ export default function LoginScreen() {
         setIsLoading(true);
 
         try {
-            console.log("Tentativo login con:", username);
+            username.trim();
+            password.trim();
 
-            // Chiamata vera al backend
+            // Esegui richiesta di login
             const response = await api.post("/user/login", {
                 username: username,
                 password: password
@@ -46,10 +38,8 @@ export default function LoginScreen() {
 
             // Passiamo token e dati utente al context che gestirà salvataggio e redirect
             authContext.logIn(token, user);
-
         } catch (error: any) {
             console.error("Login Error:", error);
-            
             let message = "Si è verificato un errore durante l'accesso.";
             
             if (error.response) {