Added Google Drive storage location

lib/screens/receipt_image_screen.dart

@@ -1,12 +1,67 @@
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
-/// Full-screen, pinch-zoomable view of a saved receipt photo.
-class ReceiptImageScreen extends StatelessWidget {
-  final String imagePath;
+import '../services/app_state.dart';
+import '../services/drive_service.dart';
 
-  const ReceiptImageScreen({super.key, required this.imagePath});
+/// Full-screen, pinch-zoomable view of a receipt photo. Pass
+/// [localImagePath] for a receipt still held locally, or [driveFileId] for
+/// one already uploaded to Drive and removed locally — in which case it's
+/// downloaded on demand (no local caching afterward).
+class ReceiptImageScreen extends StatefulWidget {
+  final String? localImagePath;
+  final String? driveFileId;
+
+  const ReceiptImageScreen({super.key, this.localImagePath, this.driveFileId})
+      : assert(localImagePath != null || driveFileId != null,
+            'Must provide either a local path or a Drive file ID');
+
+  @override
+  State<ReceiptImageScreen> createState() => _ReceiptImageScreenState();
+}
+
+class _ReceiptImageScreenState extends State<ReceiptImageScreen> {
+  Uint8List? _downloadedBytes;
+  bool _loading = false;
+  String? _error;
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.driveFileId != null) {
+      _download();
+    }
+  }
+
+  Future<void> _download() async {
+    setState(() {
+      _loading = true;
+      _error = null;
+    });
+
+    final authService = context.read<AppState>().driveAuth;
+    final client = authService.authenticatedHttpClient();
+    try {
+      final drive = DriveService(client);
+      final bytes = await drive.downloadFileBytes(widget.driveFileId!);
+      if (!mounted) return;
+      setState(() {
+        _downloadedBytes = Uint8List.fromList(bytes);
+        _loading = false;
+      });
+    } catch (e) {
+      if (!mounted) return;
+      setState(() {
+        _error = 'Could not download receipt: $e';
+        _loading = false;
+      });
+    } finally {
+      client.close();
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -17,11 +72,26 @@ class ReceiptImageScreen extends StatelessWidget {
         foregroundColor: Colors.white,
         title: const Text('Receipt'),
       ),
-      body: Center(
-        child: InteractiveViewer(
-          child: Image.file(File(imagePath)),
-        ),
-      ),
+      body: Center(child: _buildBody()),
     );
   }
+
+  Widget _buildBody() {
+    if (widget.localImagePath != null) {
+      return InteractiveViewer(child: Image.file(File(widget.localImagePath!)));
+    }
+    if (_loading) {
+      return const CircularProgressIndicator(color: Colors.white);
+    }
+    if (_error != null) {
+      return Padding(
+        padding: const EdgeInsets.all(24),
+        child: Text(_error!, style: const TextStyle(color: Colors.white)),
+      );
+    }
+    if (_downloadedBytes != null) {
+      return InteractiveViewer(child: Image.memory(_downloadedBytes!));
+    }
+    return const SizedBox.shrink();
+  }
 }