fix(models): read legacy doctype_meta_modifed_at key as a fallback

M6 (round 2): MobileFormName.fromJson falls back to the previously-misspelled
doctype_meta_modifed_at key when the corrected doctype_meta_modified_at is
absent, so any payload or replayed response still emitting the typo keeps
working. No persistence migration is needed (toJson has no callers); this is
pure read-side defense-in-depth.

Author: ankitDhwani

lib/src/models/mobile_form_name.dart

@@ -16,7 +16,13 @@ class MobileFormName {
     return MobileFormName(
       mobileDoctype: json['mobile_workspace_item'] as String? ?? '',
       groupName: json['group_name'] as String?,
-      doctypeMetaModifiedAt: json['doctype_meta_modified_at'] as String?,
+      // Read-only fallback to the previously-misspelled key so any payload
+      // (or older cached/replayed response) still emitting the typo keeps
+      // working. MobileFormName is never persisted (toJson has no callers), so
+      // no kv migration is needed — this is pure defense-in-depth.
+      doctypeMetaModifiedAt:
+          json['doctype_meta_modified_at'] as String? ??
+          json['doctype_meta_modifed_at'] as String?,
       doctypeIcon: json['doctype_icon'] as String?,
     );
   }

test/models/mobile_form_name_test.dart

@@ -26,6 +26,27 @@ void main() {
     },
   );
 
+  test(
+    'fromJson reads the legacy misspelled key as a fallback (M6)',
+    () {
+      // A payload still emitting the old `doctype_meta_modifed_at` typo must
+      // still populate doctypeMetaModifiedAt; the corrected key wins when both
+      // are present.
+      final legacyOnly = MobileFormName.fromJson({
+        'mobile_workspace_item': 'X',
+        'doctype_meta_modifed_at': '2026-02-02',
+      });
+      expect(legacyOnly.doctypeMetaModifiedAt, '2026-02-02');
+
+      final both = MobileFormName.fromJson({
+        'mobile_workspace_item': 'X',
+        'doctype_meta_modified_at': '2026-03-03',
+        'doctype_meta_modifed_at': '2026-02-02',
+      });
+      expect(both.doctypeMetaModifiedAt, '2026-03-03');
+    },
+  );
+
   test('toJson round-trips all fields', () {
     const m = MobileFormName(
       mobileDoctype: 'Attendance',