fix: Strip Symbol properties before storing events in Dexie

CRITICAL FIX for "can't serialize event with wrong or missing properties" error.

The Problem:
- Applesauce attaches Symbol properties to events for caching (SealSymbol, RumorSymbol, etc.)
- These Symbols cannot be serialized by Dexie/IndexedDB
- Attempting to store events with Symbols causes serialization errors

The Solution:
- Created serializableEvent() helper that creates plain object copies
- Strips all Symbols and non-enumerable properties
- Handles rumors (unsigned events without sig field) by using empty string
- Applied to all event storage points:
  * Gift wrap events in envelopes
  * Seal events in DecryptedRumor
  * Rumor events in DecryptedRumor
  * Pending gift wraps stored by loader

This ensures Dexie only receives plain, serializable objects while
applesauce can still use its Symbol-based caching in memory.

src/services/gift-wrap-loader.ts

@@ -22,7 +22,11 @@ import pool from "./relay-pool";
 import eventStore from "./event-store";
 import { relayListCache } from "./relay-list-cache";
 import { dmRelayListCache } from "./dm-relay-list-cache";
-import { processGiftWrap, getPendingGiftWraps } from "./gift-wrap";
+import {
+  processGiftWrap,
+  getPendingGiftWraps,
+  serializableEvent,
+} from "./gift-wrap";
 import db from "./db";
 
 /**
@@ -235,10 +239,11 @@ class GiftWrapLoader {
         await processGiftWrap(event, state.recipientPubkey, this.currentSigner);
       } else {
         // Otherwise, just store the envelope as pending
+        // Use serializableEvent to strip Symbol properties before storing
         await db.giftWraps.put({
           id: event.id,
           recipientPubkey: state.recipientPubkey,
-          event,
+          event: serializableEvent(event),
           status: "pending",
           receivedAt: Date.now(),
         });

src/services/gift-wrap.ts

@@ -42,6 +42,26 @@ export class GiftWrapError extends Error {
   }
 }
 
+/**
+ * Creates a plain serializable copy of an event object
+ * Strips Symbols and non-enumerable properties added by applesauce
+ *
+ * CRITICAL: Applesauce attaches Symbol properties to event objects for caching.
+ * These Symbols cannot be serialized by Dexie (IndexedDB). Always use this function
+ * before storing events in the database.
+ */
+export function serializableEvent(event: any): NostrEvent {
+  return {
+    id: event.id,
+    pubkey: event.pubkey,
+    created_at: event.created_at,
+    kind: event.kind,
+    tags: event.tags,
+    content: event.content,
+    sig: event.sig || "", // Rumors don't have sig, use empty string
+  };
+}
+
 /**
  * Unwraps a gift wrap and unseals to extract the rumor (full process)
  * Uses applesauce-common unlockGiftWrap helper
@@ -110,11 +130,11 @@ export async function processGiftWrap(
   // Applesauce caches seal/rumor on the event object via symbols
   eventStore.add(giftWrap);
 
-  // Store gift wrap envelope
+  // Store gift wrap envelope (use plain object to avoid Symbol serialization issues)
   const envelope: GiftWrapEnvelope = {
     id: giftWrap.id,
     recipientPubkey,
-    event: giftWrap,
+    event: serializableEvent(giftWrap),
     status: "pending",
     receivedAt: existing?.receivedAt || Date.now(),
     processedAt: Date.now(),
@@ -124,13 +144,13 @@ export async function processGiftWrap(
     // Unwrap and unseal
     const { seal, rumor } = await unwrapAndUnseal(giftWrap, signer);
 
-    // Store decrypted rumor
+    // Store decrypted rumor (use plain objects to avoid Symbol serialization issues)
     const decryptedRumor: DecryptedRumor = {
       giftWrapId: giftWrap.id,
       recipientPubkey,
       senderPubkey: seal.pubkey,
-      seal,
-      rumor,
+      seal: serializableEvent(seal),
+      rumor: serializableEvent(rumor),
       rumorCreatedAt: rumor.created_at,
       rumorKind: rumor.kind,
       decryptedAt: Date.now(),