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.

utils/dateTime.ts

@@ -39,3 +39,37 @@ export const formatPickerDate = (d: DateType | null | undefined) => {
 
     return `${yyyy}-${mm}-${dd}`;
 }
+
+/**
+ * Trasforma un timestamp in stringa "DD/MM/YYYY HH:mm:ss"
+ * @param timestamp stringa o oggetto Date
+ * @returns stringa formattata oppure vuota se input non valido
+ */
+export const formatTimestamp = (timestamp: string | Date | null | undefined): string => {
+    if (!timestamp) return '';
+
+    const date = timestamp instanceof Date ? timestamp : new Date(timestamp);
+    if (isNaN(date.getTime())) return '';
+
+    const dd = String(date.getDate()).padStart(2, '0');
+    const mm = String(date.getMonth() + 1).padStart(2, '0'); // mesi da 0 a 11
+    const yyyy = date.getFullYear();
+
+    const hh = String(date.getHours()).padStart(2, '0');
+    const min = String(date.getMinutes()).padStart(2, '0');
+    const ss = String(date.getSeconds()).padStart(2, '0');
+
+    return `${dd}/${mm}/${yyyy} ${hh}:${min}:${ss}`;
+};
+
+/**
+ * Converte un timestamp ISO in oggetto Date
+ * @param dateStr stringa data in formato ISO
+ * @returns oggetto Date corrispondente
+ */
+export const parseTimestamp = (dateStr: string | undefined | null): Date => {
+    if (!dateStr) return new Date();
+    const date = new Date(dateStr);
+    if (isNaN(date.getTime())) return new Date();
+    return date;
+};