Handle offline upload fallback as deferred pending state

memoric-app/lib/main.dart

@@ -143,6 +143,8 @@ class _UploadPageState extends State<UploadPage> {
   }
 
   Future<void> _uploadAll() async {
+    var deferredCount = 0;
+    var failedCount = 0;
     for (final item in _photos.where((i) => i.status == UploadStatus.pending)) {
       setState(() => item.status = UploadStatus.uploading);
       try {
@@ -152,9 +154,31 @@ class _UploadPageState extends State<UploadPage> {
               ? UploadStatus.done
               : UploadStatus.failed;
         });
-      } catch (_) {
-        setState(() => item.status = UploadStatus.failed);
+        if (res.statusCode != 200) {
+          failedCount++;
         }
+      } catch (e) {
+        if (_isNetworkError(e)) {
+          setState(() => item.status = UploadStatus.pending);
+          deferredCount++;
+        } else {
+          setState(() => item.status = UploadStatus.failed);
+          failedCount++;
+        }
+      }
+    }
+    if (mounted && deferredCount > 0) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            '$deferredCount upload(s) deferred: network unavailable. Try again when connection is back.',
+          ),
+        ),
+      );
+    } else if (mounted && failedCount > 0) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text('$failedCount upload(s) failed.')));
     }
     await _loadGallery();
   }
@@ -213,7 +237,7 @@ class _UploadPageState extends State<UploadPage> {
       req.headers['Authorization'] = 'Bearer $token';
       req.files.add(await http.MultipartFile.fromPath('file', file.path));
       req.fields['filename'] = p.basename(file.path);
-      return await req.send();
+      return await req.send().timeout(const Duration(seconds: 4));
     } catch (_) {
       return null;
     }
@@ -226,7 +250,14 @@ class _UploadPageState extends State<UploadPage> {
       Uri.parse('$brokerUrl/upload/$filename'),
     );
     req.files.add(await http.MultipartFile.fromPath('file', file.path));
-    return req.send();
+    return req.send().timeout(const Duration(seconds: 20));
+  }
+
+  bool _isNetworkError(Object error) {
+    return error is SocketException ||
+        error is TimeoutException ||
+        error is HttpException ||
+        error is http.ClientException;
   }
 
   Uri? _normalizeDirectEndpoint(String value) {