refactor: add Pubkey, Privkey, NoteId string aliases

This is a non-behavioral change in preparation for the actual switchover
from Strings to Ids. The purpose of this kit is to reduce the size of
the switchover commit which is going to be very large.

damus/ContentView.swift

@@ -70,11 +70,11 @@ enum FilterState : Int {
 struct ContentView: View {
     let keypair: Keypair
     
-    var pubkey: String {
+    var pubkey: Pubkey {
         return keypair.pubkey
     }
     
-    var privkey: String? {
+    var privkey: Privkey? {
         return keypair.privkey
     }
     
@@ -83,7 +83,7 @@ struct ContentView: View {
     @State var active_sheet: Sheets? = nil
     @State var damus_state: DamusState? = nil
     @SceneStorage("ContentView.selected_timeline") var selected_timeline: Timeline = .home
-    @State var muting: String? = nil
+    @State var muting: Pubkey? = nil
     @State var confirm_mute: Bool = false
     @State var user_muted_confirm: Bool = false
     @State var confirm_overwrite_mutelist: Bool = false
@@ -231,9 +231,9 @@ struct ContentView: View {
         navigationCoordinator.push(route: Route.Script(script: model))
     }
     
-    func open_profile(id: String) {
-        let profile_model = ProfileModel(pubkey: id, damus: damus_state!)
-        let followers = FollowersModel(damus_state: damus_state!, target: id)
+    func open_profile(pubkey: Pubkey) {
+        let profile_model = ProfileModel(pubkey: pubkey, damus: damus_state!)
+        let followers = FollowersModel(damus_state: damus_state!, target: pubkey)
         navigationCoordinator.push(route: Route.Profile(profile: profile_model, followers: followers))
     }
     
@@ -342,7 +342,7 @@ struct ContentView: View {
                 
                 switch res {
                 case .filter(let filt): self.open_search(filt: filt)
-                case .profile(let id):  self.open_profile(id: id)
+                case .profile(let pk):  self.open_profile(pubkey: pk)
                 case .event(let ev):    self.open_event(ev: ev)
                 case .wallet_connect(let nwc): self.open_wallet(nwc: nwc)
                 case .script(let data): self.open_script(data)
@@ -470,7 +470,7 @@ struct ContentView: View {
             guard let damus_state else { return }
 
             if local.type == .profile_zap {
-                open_profile(id: local.event_id)
+                open_profile(pubkey: local.event_id)
                 return
             }
             
@@ -656,7 +656,7 @@ struct ContentView: View {
 
 struct ContentView_Previews: PreviewProvider {
     static var previews: some View {
-        ContentView(keypair: Keypair(pubkey: "3efdaebb1d8923ebd99c9e7ace3b4194ab45512e2be79c1b7d68d9243e0d2681", privkey: nil))
+        ContentView(keypair: Keypair(pubkey: test_pubkey, privkey: nil))
     }
 }
 
@@ -680,7 +680,7 @@ extension UINavigationController: UIGestureRecognizerDelegate {
 }
 
 struct LastNotification {
-    let id: String
+    let id: NoteId
     let created_at: Int64
 }
 
@@ -689,17 +689,20 @@ func get_last_event(_ timeline: Timeline) -> LastNotification? {
     let last = UserDefaults.standard.string(forKey: "last_\(str)")
     let last_created = UserDefaults.standard.string(forKey: "last_\(str)_time")
         .flatMap { Int64($0) }
-    
-    return last.flatMap { id in
-        last_created.map { created in
-            return LastNotification(id: id, created_at: created)
-        }
+
+    guard let last,
+          let note_id = NoteId(hex: last),
+          let last_created
+    else {
+        return nil
     }
+
+    return LastNotification(id: note_id, created_at: last_created)
 }
 
 func save_last_event(_ ev: NostrEvent, timeline: Timeline) {
     let str = timeline.rawValue
-    UserDefaults.standard.set(ev.id, forKey: "last_\(str)")
+    UserDefaults.standard.set(ev.id.hex(), forKey: "last_\(str)")
     UserDefaults.standard.set(String(ev.created_at), forKey: "last_\(str)_time")
 }
 
@@ -757,18 +760,18 @@ struct FindEvent {
     let type: FindEventType
     let find_from: [String]?
     
-    static func profile(pubkey: String, find_from: [String]? = nil) -> FindEvent {
+    static func profile(pubkey: Pubkey, find_from: [String]? = nil) -> FindEvent {
         return FindEvent(type: .profile(pubkey), find_from: find_from)
     }
     
-    static func event(evid: String, find_from: [String]? = nil) -> FindEvent {
+    static func event(evid: NoteId, find_from: [String]? = nil) -> FindEvent {
         return FindEvent(type: .event(evid), find_from: find_from)
     }
 }
 
 enum FindEventType {
-    case profile(String)
-    case event(String)
+    case profile(Pubkey)
+    case event(NoteId)
 }
 
 enum FoundEvent {
@@ -961,7 +964,7 @@ func handle_post_notification(keypair: FullKeypair, postbox: PostBox, events: Ev
 
 
 enum OpenResult {
-    case profile(String)
+    case profile(Pubkey)
     case filter(NostrFilter)
     case event(NostrEvent)
     case wallet_connect(WalletConnectURL)