fix: address CodeRabbit review on PR #606

- iOS: classify the patch-manifest JSON parse error as PATCH_FAILED;
  it previously fell through unclassified and the downloadUpdate
  fallback mislabeled it DOWNLOAD_FAILED even though the download
  itself had succeeded
- type EventData.code as UpdateErrorCode instead of a loose string for
  compile-time protection against typo'd codes

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: sunnylqm

ios/RCTPushy/RCTPushy.mm

@@ -693,7 +693,10 @@ - (void)applyPatchForHash:(NSString *)hash
     NSError *error = nil;
     id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
     if (error != nil) {
-        callback(error);
+        // Classify as a patch failure like the sibling manifest branches;
+        // unclassified errors would otherwise be tagged DOWNLOAD_FAILED by the
+        // downloadUpdate fallback even though the download itself succeeded.
+        callback(PushyErrorWithCode(pushy::error_codes::kPatchFailed, error.localizedDescription));
         return;
     }
     if (![jsonObject isKindOfClass:[NSDictionary class]]) {

src/type.ts

@@ -1,3 +1,5 @@
+import type { UpdateErrorCode } from './error';
+
 export interface VersionInfo {
   name: string;
   hash: string;
@@ -61,8 +63,8 @@ export type EventType =
   | 'errorInstallApk';
 
 export interface EventData {
-  /** Stable machine-readable error code (see UpdateErrorCode); present on error events */
-  code?: string;
+  /** Stable machine-readable error code; present on error events */
+  code?: UpdateErrorCode;
   currentVersion: string;
   cInfo: {
     rnu: string;