fixed pending share race error on warm app start

lib/share_intent/pending_share.dart

@@ -12,4 +12,17 @@ class PendingShare {
   bool get hasFiles => filePaths.isNotEmpty;
   bool get hasText => text != null && text!.isNotEmpty;
   bool get isEmpty => !hasFiles && !hasText;
+
+  /// True when [other] carries the same payload. The iOS Share Extension
+  /// fires two `open(url)` requests per share (see ShareViewController), so
+  /// the same share can arrive twice on the media stream — receivedAt is
+  /// deliberately ignored here so such duplicates compare equal.
+  bool contentEquals(PendingShare other) {
+    if (text != other.text) return false;
+    if (filePaths.length != other.filePaths.length) return false;
+    for (var i = 0; i < filePaths.length; i++) {
+      if (filePaths[i] != other.filePaths[i]) return false;
+    }
+    return true;
+  }
 }