fix: cloud sync (#769)

lib/data/store/snippet.dart

@@ -14,8 +14,25 @@ class SnippetStore extends HiveStore {
   List<Snippet> fetch() {
     final ss = <Snippet>{};
     for (final key in keys()) {
-      final s = box.get(key);
-      if (s != null && s is Snippet) {
+      final s = get<Snippet>(
+        key,
+        fromObj: (val) {
+          if (val is Snippet) return val;
+          if (val is Map<dynamic, dynamic>) {
+            final map = val.toStrDynMap;
+            if (map == null) return null;
+            try {
+              final snippet = Snippet.fromJson(map as Map<String, dynamic>);
+              put(snippet);
+              return snippet;
+            } catch (e) {
+              dprint('Parsing Snippet from JSON', e);
+            }
+          }
+          return null;
+        },
+      );
+      if (s != null) {
         ss.add(s);
       }
     }