Remote sync of webdav

lib/models/fuel_entry.dart

@@ -1,6 +1,10 @@
 class FuelEntry {
   final String id;
+
+  /// References [Vehicle.id] (the hidden, immutable identifier) — not the
+  /// VIN, which is user-editable and so unsuitable as a foreign key.
   final String vehicleId;
+
   final DateTime date;
   final double gallons;
   final double pricePerGallon;
@@ -26,16 +30,21 @@ class FuelEntry {
     this.deletedAt,
   });
 
-  /// True once the receipt photo has been uploaded to Drive and the local
-  /// copy removed. Viewing it then requires downloading it on demand.
-  bool get isReceiptUploadedToDrive =>
-      receiptImagePath == null && receiptDriveFileId != null;
+  /// True once the receipt photo has been uploaded to Drive, regardless of
+  /// whether a local copy is also being kept (see the "keep photos on this
+  /// phone" setting). Viewing it locally is preferred when a local copy
+  /// exists; otherwise it requires downloading from Drive on demand.
+  bool get isReceiptUploadedToDrive => receiptDriveFileId != null;
 
-  /// True while a receipt photo exists only locally and still needs to be
-  /// uploaded next sync. A row in this state is never pushed to Drive as-is
-  /// (a local file path is meaningless on another device) — sync uploads
-  /// the image first, which clears this.
-  bool get hasPendingLocalReceipt => receiptImagePath != null;
+  /// True while a receipt photo still needs to be uploaded to Drive: a
+  /// local file exists but hasn't made it there yet. Once
+  /// [receiptDriveFileId] is set this is false — even if a local copy is
+  /// also being kept — since that field alone is what marks "no longer
+  /// needs uploading", independent of local retention. A row in this state
+  /// is never pushed to Drive as data (a local file path is meaningless on
+  /// another device) — sync uploads the image first, which sets
+  /// [receiptDriveFileId] and clears this.
+  bool get needsReceiptUpload => receiptImagePath != null && receiptDriveFileId == null;
 
   FuelEntry copyWith({
     String? receiptImagePath,