fix(client/apple): the iOS slice hit the type-checker wall, and tvOS couldn't be checked at all

`ContentView.body` grew two modifiers and stopped type-checking on the iOS slice —
"unable to type-check this expression in reasonable time", a failure macOS builds
never show and the one Apple CI never builds. Split into the screen plus its
lifecycle drivers, then the prompt chain, with each alert's presentation Binding
lifted out the way the deep-link one already was.

tvOS couldn't be checked from the command line at all: HomeView imports the slide
transition, which ships with the Xcode project only because its manifest breaks
SwiftPM's whole-graph validation. `canImport` instead of a bare `os(tvOS)` gate
makes the tvOS sources compile without it, and the app still gets the transition
because there the module is present. Both slices now typecheck by hand.

The scope switcher is tvOS-gated with them: a name prompt and a nested management
menu are not what a remote does well, and §5.4 keeps profile EDITING off
controller-first surfaces in v1 — they honor bindings and render pinned cards.

Also: release the session's settings latch when a connect fails, is refused, or is
abandoned mid-handshake. Only `disconnect` cleared it, so a failed dial left the
would-be session's resolution latched over the globals.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/Session/SessionModel.swift

@@ -361,6 +361,9 @@ final class SessionModel: ObservableObject {
                     if case .success(let conn) = result {
                         Task.detached { conn.close() } // joins Rust threads — off-main
                     }
+                    // A LATER connect has already latched its own settings; only release the
+                    // latch when nothing took over, or this would blank the live session's.
+                    if self.phase == .idle { SessionSettings.end() }
                     return
                 }
                 switch result {
@@ -383,12 +386,14 @@ final class SessionModel: ObservableObject {
                         Task.detached { conn.close() } // joins Rust threads — off-main
                         self.phase = .idle
                         self.activeHost = nil
+                        SessionSettings.end() // no session, so nothing may keep its settings latched
                         self.errorMessage = "\(host.displayName) is not paired yet. "
                             + "Pair with its PIN before streaming."
                     }
                 case .failure(let error):
                     self.phase = .idle
                     self.activeHost = nil
+                    SessionSettings.end() // the dial failed — back to the plain globals
                     if case PunktfunkClientError.rejected(let rejection) = error {
                         // The host answered and stated its reason (declined / approval timed
                         // out / busy / versions differ) — show that, and never wake-retry a