Fix NIP-05 timeline crash

Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Features/Muting/Models/MutedThreadsManager.swift

@@ -23,6 +23,7 @@ func loadOldMutedThreads(pubkey: Pubkey) -> [NoteId] {
 // We need to still use it since existing users might have their muted threads stored in UserDefaults
 // So now all it's doing is moving a users muted threads to the new kind:10000 system
 // It should not be used for any purpose beyond that
+@MainActor
 func migrate_old_muted_threads_to_new_mutelist(keypair: Keypair, damus_state: DamusState) {
     // Ensure that keypair is fullkeypair
     guard let fullKeypair = keypair.to_full() else { return }

damus/Features/Muting/Models/MutelistManager.swift

@@ -7,6 +7,7 @@
 
 import Foundation
 
+@MainActor
 class MutelistManager {
     let user_keypair: Keypair
     private(set) var event: NostrEvent? = nil
@@ -26,7 +27,7 @@ class MutelistManager {
     
     var muted_notes_cache: [NoteId: EventMuteStatus] = [:]
     
-    init(user_keypair: Keypair) {
+    nonisolated init(user_keypair: Keypair) {
         self.user_keypair = user_keypair
     }