Feature/invoice refinement (#13)

* feat(invoice): enhance invoice details

* refactor: renamed routes to pages

* fix(invoice): enhance invoice content CRUDs

* fix(invoice): add due date & fix calc

Author: mirhasalh

lib/src/isar_collection/isar_collections.dart

@@ -7,6 +7,14 @@ class Store {
   Id id = Isar.autoIncrement;
   String? name;
   String? email;
+  String? bankName;
+  String? accountNumber;
+  String? accountHolderName;
+  String? swiftCode;
+  double? tax;
+  String? thankNote;
+  String? locale;
+  String? symbol;
 }
 
 @collection
@@ -41,4 +49,5 @@ class Recipient {
   Id id = Isar.autoIncrement;
   String? name;
   String? address;
+  bool? pinned;
 }