add profile placeholder

yobble/Resources/Localizable.xcstrings

@@ -1420,7 +1420,7 @@
       }
     },
     "Неизвестный пользователь" : {
-      "comment" : "Deleted user display name\nUnknown chat title",
+      "comment" : "Deleted user display name\nMessage profile fallback title\nUnknown chat title",
       "localizations" : {
         "en" : {
           "stringUnit" : {
@@ -2228,6 +2228,7 @@
       "comment" : "Contacts placeholder message"
     },
     "Профиль" : {
+      "comment" : "Message profile placeholder nav title",
       "localizations" : {
         "en" : {
           "stringUnit" : {
@@ -2240,6 +2241,9 @@
     "Профиль в разработке" : {
       "comment" : "Search placeholder title"
     },
+    "Профиль для сообщений пока в разработке." : {
+      "comment" : "Message profile placeholder title"
+    },
     "Профиль и поиск" : {
       "localizations" : {
         "en" : {
@@ -2497,6 +2501,9 @@
     "Скоро" : {
       "comment" : "Add blocked user placeholder title\nContacts placeholder title\nЗаголовок заглушки"
     },
+    "Скоро здесь появится информация о собеседнике, статусе и дополнительных действиях." : {
+      "comment" : "Message profile placeholder description"
+    },
     "Скоро появится мини-игра, где можно заработать очки для кастомизации профиля. Следите за обновлениями!" : {
       "comment" : "Concept tab placeholder description"
     },

yobble/Views/Chat/PrivateChatView.swift

@@ -19,6 +19,7 @@ struct PrivateChatView: View {
     @State private var inputTab: ComposerTab = .chat
     @State private var isVideoPreferred: Bool = false
     @State private var legacyComposerHeight: CGFloat = 40
+    @State private var isProfilePresented: Bool = false
     @FocusState private var isComposerFocused: Bool
     @EnvironmentObject private var messageCenter: IncomingMessageCenter
     @Environment(\.dismiss) private var dismiss
@@ -30,6 +31,7 @@ struct PrivateChatView: View {
     }
 
     var body: some View {
+        ZStack {
             ScrollViewReader { proxy in
                 ZStack(alignment: .bottomTrailing) {
                     content
@@ -48,6 +50,15 @@ struct PrivateChatView: View {
                     }
                 }
             }
+
+            NavigationLink(
+                destination: MessageProfilePlaceholderView(chat: chat, currentUserId: currentUserId),
+                isActive: $isProfilePresented
+            ) {
+                EmptyView()
+            }
+            .hidden()
+        }
         .navigationTitle(toolbarTitle)
         .navigationBarTitleDisplayMode(.inline)
         .navigationBarBackButtonHidden(true)
@@ -573,11 +584,11 @@ struct PrivateChatView: View {
 
             Spacer(minLength: 0)
 
-            nameStatusView
+            nameStatusButton
 
             Spacer(minLength: 0)
 
-            avatarView
+            avatarButton
         }
         .frame(maxWidth: .infinity, minHeight: headerAvatarSize, alignment: .center)
     }
@@ -620,6 +631,20 @@ struct PrivateChatView: View {
         }
     }
 
+    private var nameStatusButton: some View {
+        Button(action: openProfile) {
+            nameStatusView
+        }
+        .buttonStyle(.plain)
+    }
+
+    private var avatarButton: some View {
+        Button(action: openProfile) {
+            avatarView
+        }
+        .buttonStyle(.plain)
+    }
+
     private func nameText(_ text: String, weight: Font.Weight) -> some View {
         Group {
             if #available(iOS 16.0, *) {
@@ -651,6 +676,10 @@ struct PrivateChatView: View {
         .contentShape(Rectangle())
     }
 
+    private func openProfile() {
+        isProfilePresented = true
+    }
+
 private var headerPlaceholderAvatar: some View {
     Circle()
         .fill(avatarBackgroundColor)
@@ -672,6 +701,157 @@ struct PrivateChatView: View {
 }
 }
 
+struct MessageProfilePlaceholderView: View {
+    let chat: PrivateChatListItem
+    let currentUserId: String?
+    private let avatarSize: CGFloat = 96
+
+    var body: some View {
+        ScrollView {
+            VStack(spacing: 24) {
+                profileAvatar
+
+                VStack(spacing: 4) {
+                    Text(displayName)
+                        .font(.title3)
+                        .fontWeight(.semibold)
+                        .multilineTextAlignment(.center)
+                        .frame(maxWidth: .infinity)
+
+                    if let login = loginDisplay {
+                        Text(login)
+                            .font(.subheadline)
+                            .foregroundColor(.secondary)
+                    }
+                }
+
+                Text(NSLocalizedString("Профиль для сообщений пока в разработке.", comment: "Message profile placeholder title"))
+                    .font(.body)
+                    .multilineTextAlignment(.center)
+
+                Text(NSLocalizedString("Скоро здесь появится информация о собеседнике, статусе и дополнительных действиях.", comment: "Message profile placeholder description"))
+                    .font(.footnote)
+                    .foregroundColor(.secondary)
+                    .multilineTextAlignment(.center)
+            }
+            .padding(.horizontal, 24)
+            .padding(.top, 60)
+            .frame(maxWidth: .infinity)
+        }
+        .background(Color(UIColor.systemBackground))
+        .navigationTitle(NSLocalizedString("Профиль", comment: "Message profile placeholder nav title"))
+        .navigationBarTitleDisplayMode(.inline)
+    }
+
+    private var displayName: String {
+        if let custom = trimmed(chat.chatData?.customName) {
+            return custom
+        }
+        if let full = trimmed(chat.chatData?.fullName) {
+            return full
+        }
+        if let login = trimmed(chat.chatData?.login) {
+            return "@\(login)"
+        }
+        return NSLocalizedString("Неизвестный пользователь", comment: "Message profile fallback title")
+    }
+
+    private var loginDisplay: String? {
+        guard let login = trimmed(chat.chatData?.login) else { return nil }
+        return "@\(login)"
+    }
+
+    private var isDeletedUser: Bool {
+        trimmed(chat.chatData?.login) == nil
+    }
+
+    private var isOfficial: Bool {
+        chat.chatData?.isOfficial ?? false
+    }
+
+    private var avatarBackgroundColor: Color {
+        if isDeletedUser {
+            return Color(.systemGray5)
+        }
+        return isOfficial ? Color.accentColor.opacity(0.85) : Color.accentColor.opacity(0.15)
+    }
+
+    private var avatarTextColor: Color {
+        if isDeletedUser {
+            return Color.accentColor
+        }
+        return isOfficial ? Color.white : Color.accentColor
+    }
+
+    private var avatarInitial: String {
+        if let name = trimmed(chat.chatData?.customName) ?? trimmed(chat.chatData?.fullName) {
+            let components = name.split(separator: " ")
+            let initials = components.prefix(2).compactMap { $0.first }
+            if !initials.isEmpty {
+                return initials.map { String($0) }.joined().uppercased()
+            }
+        }
+
+        if let login = trimmed(chat.chatData?.login) {
+            return String(login.prefix(1)).uppercased()
+        }
+
+        return "?"
+    }
+
+    private var avatarUrl: URL? {
+        guard let chatData = chat.chatData,
+              let fileId = chatData.avatars?.current?.fileId else {
+            return nil
+        }
+        let userId = chatData.userId
+        return URL(string: "\(AppConfig.API_SERVER)/v1/storage/download/avatar/\(userId)?file_id=\(fileId)")
+    }
+
+    @ViewBuilder
+    private var profileAvatar: some View {
+        if let url = avatarUrl,
+           let fileId = chat.chatData?.avatars?.current?.fileId,
+           let userId = currentUserId {
+            CachedAvatarView(url: url, fileId: fileId, userId: userId) {
+                placeholderAvatar
+            }
+            .aspectRatio(contentMode: .fill)
+            .frame(width: avatarSize, height: avatarSize)
+            .clipShape(Circle())
+        } else {
+            placeholderAvatar
+        }
+    }
+
+    private var placeholderAvatar: some View {
+        Circle()
+            .fill(avatarBackgroundColor)
+            .frame(width: avatarSize, height: avatarSize)
+            .overlay(
+                Group {
+                    if isDeletedUser {
+                        Image(systemName: "person.slash")
+                            .symbolRenderingMode(.hierarchical)
+                            .font(.system(size: avatarSize * 0.45, weight: .semibold))
+                            .foregroundColor(avatarTextColor)
+                    } else {
+                        Text(avatarInitial)
+                            .font(.system(size: avatarSize * 0.45, weight: .semibold))
+                            .foregroundColor(avatarTextColor)
+                    }
+                }
+            )
+    }
+
+    private func trimmed(_ text: String?) -> String? {
+        guard let text = text?.trimmingCharacters(in: .whitespacesAndNewlines), !text.isEmpty else {
+            return nil
+        }
+        return text
+    }
+}
+
 #if canImport(UIKit)
 private struct LegacyMultilineTextView: UIViewRepresentable {
     @Binding var text: String