Add FilamentModel with all properties and refactor notes as optional

lib/models/filament_model.dart

@@ -0,0 +1,78 @@
+class FilamentModel {
+  final String documentId;
+  final String name;
+  final String type;
+  final String color;
+  final double weight;
+  final double weightUsed;
+  final double price;
+  final String manufacture;
+  final String purchaseDate;
+  final String? notes;
+  final int printingTemp;
+  final int bedTemp;
+
+  FilamentModel({
+    required this.documentId,
+    required this.name,
+    required this.type,
+    required this.color,
+    required this.weight,
+    required this.weightUsed,
+    required this.price,
+    required this.manufacture,
+    required this.purchaseDate,
+    this.notes,
+    required this.printingTemp,
+    required this.bedTemp,
+  });
+
+  static FilamentModel fromJson(Map<String, dynamic> json) {
+    return FilamentModel(
+      documentId: json['\$id'],
+      name: json['name'],
+      type: json['type'],
+      color: json['color'],
+      weight: (json['weight'] as num).toDouble(),
+      weightUsed: (json['weightUsed'] as num).toDouble(),
+      price: (json['price'] as num).toDouble(),
+      manufacture: json['manufacture'],
+      purchaseDate: json['purchaseDate'],
+      notes: json['notes'] as String?,
+      printingTemp: json['printingTemp'],
+      bedTemp: json['bedTemp'],
+    );
+  }
+
+  static Map<String, dynamic> toMapForAppwrite(FilamentModel filamentModel) {
+    return {
+      'name': filamentModel.name,
+      'type': filamentModel.type,
+      'color': filamentModel.color,
+      'weight': filamentModel.weight,
+      'weightUsed': filamentModel.weightUsed,
+      'price': filamentModel.price,
+      'manufacture': filamentModel.manufacture,
+      'purchaseDate': filamentModel.purchaseDate,
+      if (filamentModel.notes != null) 'notes': filamentModel.notes,
+      'printingTemp': filamentModel.printingTemp,
+      'bedTemp': filamentModel.bedTemp,
+    };
+  }
+
+  // An empty instance for initialization or default values
+  static final empty = FilamentModel(
+    documentId: '00',
+    name: '',
+    type: '',
+    color: '',
+    weight: 0.0,
+    weightUsed: 0.0,
+    price: 0.0,
+    manufacture: '',
+    purchaseDate: '',
+    notes: null,
+    printingTemp: 0,
+    bedTemp: 0,
+  );
+}