Verify decoder integration E2E and fix live metadata probing and mapping

web/decoder-channel-playback.js

@@ -29,13 +29,18 @@ window.DecoderChannelPlayback = async () => class DecoderChannelPlayback {
                 cancelButton.id = 'decoderPlaybackExit'; cancelButton.textContent = 'Zatrzymaj i wróć do kanałów';
                 cancelButton.style.cssText = 'position:fixed;right:16px;top:72px;z-index:2147483647;background:#252525;color:white;border:1px solid #aaa;border-radius:6px;padding:12px;font:16px system-ui;cursor:pointer';
                 cancelButton.onclick = () => void leave(); document.body.append(cancelButton);
-                let opened = false; const deadline = Date.now() + 25000;
+                let opened = false, opening = false; const deadline = Date.now() + 25000;
                 watcher = setInterval(() => {
                     if (ticket !== generation) return;
                     const video = document.querySelector('video');
                     const player = playbackManager.getCurrentPlayer();
                     if (player?.isLocalPlayer === false) { clearControls(); return; }
-                    if (!opened && video && player) { opened = true; void appRouter.showVideoOsd(); }
+                    if (!opened && !opening && video?.readyState >= 1 && player) {
+                        opening = true;
+                        Promise.resolve(appRouter.showVideoOsd()).then(() => { opened = true; })
+                            .catch(() => { /* A cancelled/unready native route can be retried. */ })
+                            .finally(() => { opening = false; });
+                    }
                     if (video?.readyState >= 2 && video.currentTime > 0) return;
                     if (Date.now() >= deadline) { void leave(); toast('Kanał nie przesyła obrazu. Powrót do listy kanałów.'); }
                 }, 250);