The live player's retry and stall timers do nothing once the player is torn down (RUM: Cannot set properties of null) (#328)

ddiff --git a/public/js/stream-player.js b/public/js/stream-player.js
iindex 59bfe4ae..f2a126d1 100644
---- a/public/js/stream-player.js
++++ b/public/js/stream-player.js
@@@ -1581,8 +1581,10 @@ async function handleSfuViewerReady(msg, ws, video, updateStatus, scheduleRewatc
                  if (!_hasVideoFrames && !player._stallTimer) {
                      console.log('[Player] SFU transport connected — starting 20s first-frame grace window');
                      player._stallTimer = setTimeout(() => {
++                        // The player can be torn down (player = null) before this fires: RUM saw the TypeError.
++                        if (!player) return;
                          player._stallTimer = null;
--                        if (!player || player._sfuRecvTransport !== recvTransport || _hasVideoFrames) return;
++                        if (player._sfuRecvTransport !== recvTransport || _hasVideoFrames) return;
                          const streamTracks = video.srcObject?.getTracks() || [];
                          const trackInfo = streamTracks.map(t => `${t.kind}:${t.readyState}:enabled=${t.enabled}:muted=${t.muted}`).join(', ');
                          console.warn(`[Player] SFU video stall — no frames after 20s post-connect | readyState=${video.readyState} videoWidth=${video.videoWidth} paused=${video.paused} currentTime=${video.currentTime.toFixed(2)} networkState=${video.networkState} error=${video.error?.message || 'none'} srcObjectActive=${video.srcObject?.active} tracks=[${trackInfo}] transportState=${recvTransport.connectionState}`);
@@@ -1659,19 +1661,16 @@ async function handleSfuViewerReady(msg, ws, video, updateStatus, scheduleRewatc
              }).catch((err) => {
                  _playPending = false;
                  console.warn(`[Player] play() failed: ${err.name}: ${err.message} — readyState=${video.readyState} videoWidth=${video.videoWidth} networkState=${video.networkState}`);
--                if (err.name === 'AbortError') {
--                    player._playRetryTimer = setTimeout(() => {
--                        player._playRetryTimer = null;
--                        _playPending = false;
--                        tryPlay();
--                    }, 300);
--                } else {
--                    player._playRetryTimer = setTimeout(() => {
--                        player._playRetryTimer = null;
--                        _playPending = false;
--                        tryPlay();
--                    }, 1000);
--                }
++                // A play() that settles after the player was torn down retries nothing (RUM: "Cannot set properties of
++                // null (setting '_playRetryTimer')").
++                if (!player) return;
++                const retryIn = err.name === 'AbortError' ? 300 : 1000;
++                player._playRetryTimer = setTimeout(() => {
++                    if (!player) return;
++                    player._playRetryTimer = null;
++                    _playPending = false;
++                    tryPlay();
++                }, retryIn);
              });
          };
  
@@@ -1875,8 +1874,9 @@ async function handleSfuViewerReady(msg, ws, video, updateStatus, scheduleRewatc
          // Start playback after all tracks consumed
          if (consumedCount >= 2) {
              tryPlay();
--        } else {
++        } else if (player) {
              player._playRetryTimer = setTimeout(() => {
++                if (!player) return;
                  player._playRetryTimer = null;
                  _playPending = false;
                  tryPlay();