fix(player-web): independent per-zone rotation in multi-zone layouts

Mirror of the Android fix. The web player showed only the FIRST assignment per
zone (playlist.find) and an image zone set the GLOBAL advanceTimer->nextItem, so
the whole layout re-rendered on one global tick instead of each zone cycling its
own content. Now each zone groups its assignments (by zone_id, sorted), renders
the first, and advances on its OWN timer (images/widgets/youtube: duration;
videos: on end; single-item zones loop). Cleared in teardown. Also render zones
before the single-item 'renderable?' bail so an empty current item can't blank
the screen.

server/player/index.html

@@ -329,6 +329,9 @@
     // playback muted).
     let userHasInteracted = false;
     let advanceTimer = null;
+    // Per-zone rotation timers (multi-zone). Each zone advances independently on
+    // its own interval, decoupled from the fullscreen advanceTimer/nextItem.
+    let zoneTimers = {};
     // Video wall state. wallConfig is the tile assignment from the server
     // (null when this device isn't in a wall). The leader runs the playlist
     // normally and broadcasts wall:sync every second; followers don't run
@@ -1297,8 +1300,14 @@
     // releases the decoder and kills audio. Null event handlers so a late onended
     // can't fire into a stale playlist state. Queries all <video> elements so
     // zone-mode (multi-region) videos get cleaned up too, not just currentVideoEl.
+    function clearZoneTimers() {
+      for (const k in zoneTimers) clearTimeout(zoneTimers[k]);
+      zoneTimers = {};
+    }
+
     function teardownCurrentMedia() {
       if (advanceTimer) { clearTimeout(advanceTimer); advanceTimer = null; }
+      clearZoneTimers();
       const container = document.getElementById('playerContainer');
       if (container) {
         container.querySelectorAll('video').forEach(v => {
@@ -1320,6 +1329,14 @@
       const container = document.getElementById('playerContainer');
       container.style.display = 'block';
 
+      // Multi-zone: each zone pulls + rotates its own assignments by zone_id,
+      // independent of the "current item". Render zones here (before the single-item
+      // bail) so an empty/placeholder current item can't blank the whole screen.
+      if (layout && layout.zones && layout.zones.length > 1 && !wallConfig) {
+        renderZones(container, item);
+        return;
+      }
+
       // Defense in depth: bail to waiting state on missing/malformed item rather
       // than fall through every branch and leave a blank container.
       const hasRenderableType = item && (
@@ -1444,52 +1461,81 @@
     }
 
     function renderZones(container, defaultItem) {
-      // Multi-zone layout
+      clearZoneTimers();
+      // Group assignments by zone, ordered by sort_order so each zone rotates its
+      // OWN list independently (images/widgets on a duration timer, videos on end)
+      // rather than every zone re-rendering on a single global tick.
+      const byZone = {};
+      for (const a of playlist) {
+        const zid = a.zone_id || '__none__';
+        (byZone[zid] = byZone[zid] || []).push(a);
+      }
+      for (const k in byZone) byZone[k].sort((x, y) => (x.sort_order || 0) - (y.sort_order || 0));
+
+      let unassignedUsed = false;
       layout.zones.forEach(zone => {
+        let items = byZone[zone.id];
+        if ((!items || !items.length) && !unassignedUsed && byZone['__none__']) {
+          unassignedUsed = true; items = byZone['__none__'];
+        }
+        if ((!items || !items.length) && defaultItem) items = [defaultItem];
+        if (!items || !items.length) return;
+
         const div = document.createElement('div');
         div.className = 'zone';
         div.style.cssText = `left:${zone.x_percent}%;top:${zone.y_percent}%;width:${zone.width_percent}%;height:${zone.height_percent}%;z-index:${zone.z_index || 0}`;
-
-        // Find assignment for this zone
-        const assignment = playlist.find(a => a.zone_id === zone.id) || defaultItem;
-        if (!assignment) return;
-
-        const isVideo = assignment.mime_type?.startsWith('video/');
-        const src = assignment.remote_url || `${config.serverUrl}/uploads/content/${assignment.filepath}`;
-
-        const isYoutubeZone = assignment.mime_type === 'video/youtube';
-
-        if (zone.zone_type === 'widget' && assignment.widget_id) {
-          const iframe = document.createElement('iframe');
-          iframe.src = `${config.serverUrl}/api/widgets/${assignment.widget_id}/render`;
-          // Sandbox into a unique origin so widget scripts can't read window.parent
-          // state (localStorage / JWT). allow-scripts keeps inline widget code running.
-          iframe.setAttribute('sandbox', 'allow-scripts');
-          div.appendChild(iframe);
-        } else if (isYoutubeZone) {
-          createYoutubeEmbed(src, assignment, div);
-        } else if (isVideo) {
-          const video = document.createElement('video');
-          video.src = src;
-          video.autoplay = true;
-          video.muted = (zone.sort_order > 0); // Only first zone has audio
-          video.loop = (playlist.length === 1);
-          video.playsInline = true;
-          video.style.cssText = `width:100%;height:100%;object-fit:${zone.fit_mode || 'cover'}`;
-          if (!video.loop) video.onended = () => nextItem();
-          div.appendChild(video);
-        } else {
-          const img = document.createElement('img');
-          img.src = src;
-          img.style.cssText = `width:100%;height:100%;object-fit:${zone.fit_mode || 'cover'}`;
-          div.appendChild(img);
-          if (playlist.length > 1) advanceTimer = setTimeout(nextItem, (assignment.duration_sec || 10) * 1000);
-        }
-
         container.appendChild(div);
+        showZoneItem(zone, div, items, 0);
       });
     }
 
+    // Render items[index] in a zone and schedule the next item on the zone's OWN
+    // timer (images/widgets/youtube: duration; videos: on end). Single-item zones
+    // loop / don't advance.
+    function showZoneItem(zone, div, items, index) {
+      if (zoneTimers[zone.id]) { clearTimeout(zoneTimers[zone.id]); delete zoneTimers[zone.id]; }
+      const a = items[index % items.length];
+      const multi = items.length > 1;
+      const advance = () => showZoneItem(zone, div, items, index + 1);
+      // Tear down any prior media in this zone before swapping.
+      div.querySelectorAll('video').forEach(v => { try { v.onended = null; v.pause(); v.removeAttribute('src'); v.load(); } catch (e) {} });
+      div.innerHTML = '';
+
+      const isYoutube = a.mime_type === 'video/youtube';
+      const isVideo = !isYoutube && a.mime_type?.startsWith('video/');
+      const src = a.remote_url || `${config.serverUrl}/uploads/content/${a.filepath}`;
+      const dur = (a.duration_sec || 10) * 1000;
+
+      if (zone.zone_type === 'widget' && a.widget_id) {
+        const iframe = document.createElement('iframe');
+        iframe.src = `${config.serverUrl}/api/widgets/${a.widget_id}/render`;
+        // Sandbox into a unique origin so widget scripts can't read window.parent
+        // state (localStorage / JWT). allow-scripts keeps inline widget code running.
+        iframe.setAttribute('sandbox', 'allow-scripts');
+        div.appendChild(iframe);
+        if (multi) zoneTimers[zone.id] = setTimeout(advance, dur);
+      } else if (isYoutube) {
+        createYoutubeEmbed(src, a, div);
+        if (multi) zoneTimers[zone.id] = setTimeout(advance, dur);
+      } else if (isVideo) {
+        const video = document.createElement('video');
+        video.src = src;
+        video.autoplay = true;
+        video.muted = (zone.sort_order > 0); // Only first zone has audio
+        video.loop = !multi; // single-item zone loops; multi advances on end
+        video.playsInline = true;
+        video.style.cssText = `width:100%;height:100%;object-fit:${zone.fit_mode || 'cover'}`;
+        if (multi) video.onended = advance;
+        div.appendChild(video);
+      } else {
+        const img = document.createElement('img');
+        img.src = src;
+        img.style.cssText = `width:100%;height:100%;object-fit:${zone.fit_mode || 'cover'}`;
+        div.appendChild(img);
+        if (multi) zoneTimers[zone.id] = setTimeout(advance, dur);
+      }
+    }
+
     // ==================== Screenshots ====================
     function captureAndSend() {
       if (!socket?.connected) return;