iPhone app: a first screen that says exactly what to do

The app finds the Frame by itself (Valve's _steamos-devkit._tcp Bonjour
service, else the saved address or frame.local on port 22), so setup is two
numbered steps: wake your Frame (Looking… / Found ✓, and after a few seconds
exactly what to check), then the Developer Mode password and Connect. Manual
address and key options sit under Other ways to connect.

A paired Frame that doesn't answer is almost always asleep: instead of an
error, Waiting for your Frame says how to wake it and connects as soon as its
SSH port answers (checked every 3 s; 4 s after the stand-in came back).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

ios/FrameControl/App/AppModel.swift

@@ -92,7 +92,7 @@ final class AppModel: ObservableObject {
     }
 
     /// "host", "host:port" or "[v6]:port", plus a user name.
-    static func parse(host: String, user: String) -> FrameSettings? {
+    nonisolated static func parse(host: String, user: String) -> FrameSettings? {
         var target = FrameSettings(host: host.trimmingCharacters(in: .whitespaces), user: user.trimmingCharacters(in: .whitespaces))
         if target.host.hasPrefix("["), let close = target.host.firstIndex(of: "]") {
             let rest = target.host[target.host.index(after: close)...]