fix(desktop): verify user pubkey via get_public_key after nostrconnect login

The nostrconnect flow was trusting params[0] from the signer's connect
message as the user's pubkey. Some signers (e.g. nsec.app) don't put
the actual user pubkey there, causing all relay subscriptions to query
the wrong identity — contact lists, profiles, and DMs all returned empty.

Now calls remoteSigner.getPublicKey() after the handshake to get the
verified pubkey from the signer. Also stabilizes FeedScreen relay
subscriptions with distinctUntilChanged() and adds relay.primal.net
to defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip46RemoteSigner/signer/NostrSignerRemote.kt

@@ -42,12 +42,6 @@ import com.vitorpamplona.quartz.nip46RemoteSigner.NostrConnectEvent
 import com.vitorpamplona.quartz.nip57Zaps.LnZapPrivateEvent
 import com.vitorpamplona.quartz.nip57Zaps.LnZapRequestEvent
 import com.vitorpamplona.quartz.utils.Hex
-import com.vitorpamplona.quartz.utils.TimeUtils
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.cancel
-import kotlinx.coroutines.launch
 
 class NostrSignerRemote(
     val signer: NostrSignerInternal,
@@ -57,8 +51,6 @@ class NostrSignerRemote(
     val permissions: String? = null,
     val secret: String? = null,
 ) : NostrSigner(signer.pubKey) {
-    private val scope = CoroutineScope(Dispatchers.Default + SupervisorJob())
-
     private val manager =
         RemoteSignerManager(
             signer = signer,
@@ -74,17 +66,10 @@ class NostrSignerRemote(
                 Filter(
                     kinds = listOf(NostrConnectEvent.KIND),
                     tags = mapOf("p" to listOf(signer.pubKey)),
-                    since = TimeUtils.now() - 60,
                 ),
         ) { event ->
             if (event is NostrConnectEvent) {
-                scope.launch {
-                    try {
-                        manager.newResponse(event)
-                    } catch (_: Exception) {
-                        // Ignore events we can't decrypt or parse
-                    }
-                }
+                manager.newResponse(event)
             }
         }
 
@@ -94,7 +79,6 @@ class NostrSignerRemote(
 
     fun closeSubscription() {
         subscription.close()
-        scope.cancel()
     }
 
     override fun isWriteable(): Boolean = true
@@ -303,10 +287,9 @@ class NostrSignerRemote(
             permissions: String? = null,
         ): NostrSignerRemote {
             if (!bunkerUri.startsWith("bunker://")) throw Exception("Invalid bunker uri")
-            val splitData = bunkerUri.split("?", limit = 2)
+            val splitData = bunkerUri.split("?")
             val remotePubkey = splitData[0].removePrefix("bunker://")
             if (!Hex.isHex(remotePubkey)) throw Exception("Invalid pubkey in bunker uri")
-            if (splitData.size < 2) throw Exception("Missing query parameters in bunker uri")
             val params = splitData[1].split("&")
             val relays = mutableSetOf<NormalizedRelayUrl>()
             var secret: String? = null