Start major rework for DataGrid display

For editing of file properties, etc.

Models/ReportFile.cs

@@ -0,0 +1,78 @@
+using System;
+using System.IO;
+using ReceiptPDFBuilder.Helpers;
+
+namespace ReceiptPDFBuilder.Models;
+
+class ReportFile : ChangeNotifier
+{
+    private string _title;
+    private DateOnly _date;
+    private DateTime _dateTime;
+    private DateTimeOffset _dto;
+    private string _notes;
+    private string _filePath;
+
+    public ReportFile()
+    {
+        _title = "";
+        _date = DateOnly.FromDateTime(DateTime.Now);
+        _notes = "";
+        _filePath = "";
+    }
+
+    public string Title
+    {
+        get => _title;
+        set { _title = value; NotifyPropertyChanged(); }
+    }
+
+    public DateOnly Date
+    {
+        get => _date;
+        set 
+        { 
+            _date = value; 
+            DateTime = value.ToDateTime(TimeOnly.MinValue);
+            DTO = new DateTimeOffset(value.ToDateTime(TimeOnly.MinValue)); 
+            NotifyPropertyChanged(); 
+        }
+    }
+
+    public DateTime DateTime
+    {
+        get => _dateTime;
+        set 
+        { 
+            _dateTime = value; 
+            NotifyPropertyChanged(); 
+        }
+    }
+
+    public DateTimeOffset DTO
+    {
+        get => _dto;
+        set 
+        { 
+            _dto = value; 
+            NotifyPropertyChanged(); 
+        }
+    }
+
+    public string Notes
+    {
+        get => _notes;
+        set { _notes = value; NotifyPropertyChanged(); }
+    }
+
+    public string FilePath
+    {
+        get => _filePath;
+        set { _filePath = value; NotifyPropertyChanged(); }
+    }
+
+    public string FileName
+    {
+        get => Path.GetFileName(_filePath);
+    }
+}