Fix HLS browser in prod e stabilizza broadcast RTMP su iOS.

Il proxy Rails gestisce il redirect MediaMTX su /live/match_* e riscrive le playlist; edge nginx reindirizza /live/ sotto /hls/. Su iOS, SessionBuilder HaishinKit, pipeline mixer corretta e refresh token.

Co-authored-by: Cursor <cursoragent@cursor.com>

native/ios/MatchLiveTv/UI/Broadcast/BroadcastScreen.swift

@@ -79,7 +79,12 @@ struct BroadcastScreen: View {
         .onChange(of: scoreController.lastActionError) { message in
             if let message { snackbarMessage = message }
         }
-        .onChange(of: broadcastCoordinator.metrics.phase) { _ in updateOverlay() }
+        .onChange(of: broadcastCoordinator.metrics.phase) { phase in
+            updateOverlay()
+            if phase == .error, let message = broadcastCoordinator.metrics.lastError {
+                self.error = message
+            }
+        }
         .alert("Errore", isPresented: Binding(get: { error != nil }, set: { if !$0 { error = nil } })) {
             Button("OK") { onFinished() }
         } message: {
@@ -287,18 +292,19 @@ struct BroadcastScreen: View {
             match = loadedMatch
             container.scoreController.bind(sessionId: sessionId, initial: loaded.score)
             wireCable()
+            await preloadLogos(for: loadedMatch)
+            loading = false
+            updateOverlay()
+            try? await Task.sleep(nanoseconds: 100_000_000)
             if let url = loaded.rtmpIngestUrl, !url.isEmpty {
                 let config = broadcastConfig(for: loaded, rtmpUrl: url)
                 if loaded.isPaused {
                     try await container.broadcastCoordinator.engine.preparePreview(config: config)
                 } else {
-                    try await container.broadcastCoordinator.startBroadcast(config: config)
+                    try await container.broadcastCoordinator.engine.prepareForBroadcast(config: config)
                 }
             }
-            await preloadLogos(for: loadedMatch)
             startPolling()
-            loading = false
-            updateOverlay()
         } catch {
             if let message = UserFacingError.message(for: error) {
                 self.error = message