A whole bunch of changes

lib/widgets/receipt_thumbnail.dart

@@ -0,0 +1,61 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import '../models/fuel_entry.dart';
+import '../screens/receipt_image_screen.dart';
+
+/// A fuel entry's receipt as a tappable thumbnail: the local photo if one's
+/// still on-device, a cloud icon (tap to download-and-view) if it's been
+/// uploaded and the local copy cleared, or a plain placeholder if there's
+/// no receipt at all. Shared by [VehicleDetailScreen]'s entry list, the
+/// cross-vehicle Receipts tab, [ReceiptDetailScreen] (at a larger [size],
+/// as its primary preview), and [EditFuelEntryScreen] so all four present a
+/// receipt the same way.
+///
+/// Tapping it opens the full-screen photo viewer by default; pass [onTap]
+/// to send it somewhere else instead (e.g. the list rows send it to
+/// [ReceiptDetailScreen] instead of straight to the photo).
+class ReceiptThumbnail extends StatelessWidget {
+  final FuelEntry entry;
+  final double size;
+  final VoidCallback? onTap;
+
+  const ReceiptThumbnail({super.key, required this.entry, this.size = 48, this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    if (entry.receiptImagePath != null) {
+      return GestureDetector(
+        onTap: onTap ??
+            () => Navigator.of(context).push(
+                  MaterialPageRoute(
+                    builder: (_) => ReceiptImageScreen(localImagePath: entry.receiptImagePath),
+                  ),
+                ),
+        child: ClipRRect(
+          borderRadius: BorderRadius.circular(6),
+          child: Image.file(
+            File(entry.receiptImagePath!),
+            width: size,
+            height: size,
+            fit: BoxFit.cover,
+          ),
+        ),
+      );
+    }
+    if (entry.isReceiptUploadedToDrive) {
+      return GestureDetector(
+        onTap: onTap ??
+            () => Navigator.of(context).push(
+                  MaterialPageRoute(
+                    builder: (_) => ReceiptImageScreen(driveFileId: entry.receiptDriveFileId),
+                  ),
+                ),
+        child: CircleAvatar(radius: size / 2, child: Icon(Icons.cloud_outlined, size: size * 0.5)),
+      );
+    }
+    final placeholder = CircleAvatar(radius: size / 2, child: Icon(Icons.receipt_long, size: size * 0.5));
+    return onTap == null ? placeholder : GestureDetector(onTap: onTap, child: placeholder);
+  }
+}