fix(desktop): drop since on kind:1059 sub to honor NIP-17 randomized timestamps

Per NIP-17, seal (kind 13) and gift wrap (kind 1059) created_at are
randomized up to 2 days in the past for privacy. A subscription that
applies a `since` window — even with a 2-day adjustment — silently drops
wraps whose randomized timestamp predates the window, losing real DMs
and suppressing the unread badge.

Today only one caller (the desktop subscription coordinator) reaches
FilterDMs.giftWrapsToMe and it already passes no `since`, but the
parameter remained on the function signature as a footgun. Drop it so
the invariant is enforceable by the type, and document why in KDoc.

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/subscriptions/FilterDMs.kt

@@ -27,7 +27,6 @@ import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip04Dm.messages.PrivateDmEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.EphemeralGiftWrapEvent
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
-import com.vitorpamplona.quartz.utils.TimeUtils
 
 /**
  * Filter builders for DM subscriptions on desktop.
@@ -116,20 +115,18 @@ object FilterDMs {
      * Creates a filter for NIP-59 gift-wrapped events TO the user.
      * Gift wraps (kind 1059) contain encrypted NIP-17 DMs.
      *
-     * The since is adjusted back by 2 days because gift wrap created_at
-     * timestamps are randomized within a 2-day window for privacy.
+     * No `since` is exposed: per NIP-17, seal (kind 13) and gift wrap (kind 1059)
+     * `created_at` are randomized up to 2 days in the past for privacy. Any
+     * `since` window applied here silently drops wraps whose randomized
+     * timestamp predates it — losing real DMs and suppressing the unread badge.
+     * DMs are low-volume, so subscribing without a `since` is safe.
      *
      * @param userPubKeyHex The user's public key (hex)
-     * @param since Optional since timestamp (will be adjusted -2 days)
      */
-    fun giftWrapsToMe(
-        userPubKeyHex: HexKey,
-        since: Long? = null,
-    ): Filter =
+    fun giftWrapsToMe(userPubKeyHex: HexKey): Filter =
         Filter(
             kinds = listOf(GiftWrapEvent.KIND, EphemeralGiftWrapEvent.KIND),
             tags = mapOf("p" to listOf(userPubKeyHex)),
-            since = since?.minus(TimeUtils.twoDays()),
         )
 }
 
@@ -184,11 +181,13 @@ fun createNip04DmOutboxSubscription(
 /**
  * Creates a subscription config for NIP-59 gift-wrapped DMs TO the user.
  * Subscribes on DM/inbox relays.
+ *
+ * No `since` parameter: see [FilterDMs.giftWrapsToMe] for why NIP-17 wraps
+ * cannot use a `since` window without dropping legitimate messages.
  */
 fun createGiftWrapSubscription(
     relays: Set<NormalizedRelayUrl>,
     userPubKeyHex: HexKey,
-    since: Long? = null,
     onEvent: (Event, Boolean, NormalizedRelayUrl, List<Filter>?) -> Unit,
     onEose: (NormalizedRelayUrl, List<Filter>?) -> Unit = { _, _ -> },
 ): SubscriptionConfig? {
@@ -196,7 +195,7 @@ fun createGiftWrapSubscription(
 
     return SubscriptionConfig(
         subId = generateSubId("giftwrap-${userPubKeyHex.take(8)}"),
-        filters = listOf(FilterDMs.giftWrapsToMe(userPubKeyHex, since)),
+        filters = listOf(FilterDMs.giftWrapsToMe(userPubKeyHex)),
         relays = relays,
         onEvent = onEvent,
         onEose = onEose,