Improve startup UX with placeholders and prefetch

Sources/Views/MainView.swift

@@ -103,16 +103,26 @@ struct MainView: View {
             }
         }
         .onAppear {
+            let initialID: UUID?
             if let storedID = UserDefaults.standard.string(forKey: "selectedServerID"),
                let uuid = UUID(uuidString: storedID),
                servers.contains(where: { $0.id == uuid }) {
                 print("✅ [MainView] Restored selected server \(uuid)")
-                selectedServerID = uuid
-            } else if selectedServerID == nil, let first = servers.first {
+                initialID = uuid
+            } else if let first = servers.first {
                 print("✅ [MainView] Selecting first server \(first.hostname)")
-                selectedServerID = first.id
+                initialID = first.id
             } else {
                 print("ℹ️ [MainView] No stored selection")
+                initialID = nil
+            }
+
+            selectedServerID = initialID
+
+            if let initialID {
+                Task {
+                    await prefetchOtherServers(activeID: initialID)
+                }
             }
             pingAllServers()
             pingTimer = Timer.scheduledTimer(withTimeInterval: 10.0, repeats: true) { _ in
@@ -157,6 +167,39 @@ struct MainView: View {
             }
         }
     }
+
+    private func prefetchOtherServers(activeID: UUID) async {
+        let others = servers.filter { $0.id != activeID }
+        await withTaskGroup(of: Void.self) { group in
+            for server in others {
+                group.addTask {
+                    await fetchServerInfoAsync(for: server.id)
+                }
+            }
+        }
+    }
+
+    private func fetchServerInfoAsync(for id: UUID) async {
+        guard let server = servers.first(where: { $0.id == id }) else { return }
+        guard let apiKey = KeychainHelper.loadApiKey(for: server.hostname)?.trimmingCharacters(in: .whitespacesAndNewlines),
+              !apiKey.isEmpty,
+              let baseURL = URL(string: "https://\(server.hostname)")
+        else { return }
+
+        do {
+            let api = try await APIFactory.detectAndCreateAPI(baseURL: baseURL, apiKey: apiKey)
+            let info = try await api.fetchServerSummary(apiKey: apiKey)
+            await MainActor.run {
+                if let index = servers.firstIndex(where: { $0.id == id }) {
+                    var updated = servers[index]
+                    updated.info = info
+                    servers[index] = updated
+                }
+            }
+        } catch {
+            print("❌ Prefetch failed for \(server.hostname): \(error)")
+        }
+    }
     
     private func moveServer(from source: IndexSet, to destination: Int) {
         servers.move(fromOffsets: source, toOffset: destination)