Fix warnings and update tracability

src/routes/player/[id]/+page.svelte

@@ -143,6 +143,10 @@
         } catch (e) {
           // Ignore - queue status will update via polling
         }
+        // Fetch next episode for video skip button
+        if (isVideo) {
+          fetchNextEpisode(item);
+        }
         return;
       }
 
@@ -411,8 +415,11 @@
       loading = false;
 
       // Fetch next episode for video episodes (for skip button)
+      console.log("[NextEpisode] Post-load check: isVideo=", isVideo, "currentMedia=", currentMedia?.type, currentMedia?.name);
       if (isVideo && currentMedia) {
         fetchNextEpisode(currentMedia);
+      } else {
+        console.log("[NextEpisode] Skipped fetchNextEpisode - isVideo:", isVideo, "currentMedia:", !!currentMedia);
       }
     } catch (e) {
       console.error("loadAndPlay error:", e);
@@ -528,21 +535,35 @@
 
   async function fetchNextEpisode(media: MediaItem) {
     nextEpisode = null;
-    if (media.type !== "Episode" || !media.seriesId) return;
+    console.log("[NextEpisode] fetchNextEpisode called:", { type: media.type, seriesId: media.seriesId, seasonId: media.seasonId, indexNumber: media.indexNumber, id: media.id, name: media.name });
+    if (media.type !== "Episode" || !media.seasonId || media.indexNumber == null) {
+      console.log("[NextEpisode] Skipping - not an episode or missing seasonId/indexNumber");
+      return;
+    }
     try {
       const repo = auth.getRepository();
-      const episodes = await repo.getNextUpEpisodes(media.seriesId, 1);
-      if (episodes.length > 0 && episodes[0].id !== media.id) {
-        nextEpisode = episodes[0];
+      // Fetch all episodes in the season sorted by episode number
+      const result = await repo.getItems(media.seasonId, { sortBy: "IndexNumber", sortOrder: "Ascending", limit: 500 });
+      const episodes = result.items.filter(e => e.type === "Episode");
+      console.log("[NextEpisode] Season has", episodes.length, "episodes, current index:", media.indexNumber);
+
+      // Find the episode after the current one by index number
+      const currentIdx = episodes.findIndex(e => e.id === media.id);
+      if (currentIdx >= 0 && currentIdx < episodes.length - 1) {
+        nextEpisode = episodes[currentIdx + 1];
+        console.log("[NextEpisode] Set nextEpisode:", nextEpisode.name, "index:", nextEpisode.indexNumber);
+      } else {
+        console.log("[NextEpisode] No next episode in season (current position:", currentIdx, "of", episodes.length, ")");
       }
     } catch (e) {
-      console.error("Failed to fetch next episode:", e);
+      console.error("[NextEpisode] Failed to fetch next episode:", e);
     }
   }
 
   function handleSkipToNextEpisode() {
     if (nextEpisode) {
-      goto(`/player/${nextEpisode.id}`);
+      // Use replaceState so "close/back" returns to the library, not the previous episode
+      goto(`/player/${nextEpisode.id}`, { replaceState: true });
     }
   }
 
@@ -605,7 +626,7 @@
   <VideoPlayer
     media={currentMedia}
     {streamUrl}
-    mediaSourceId={mediaSourceId}
+    mediaSourceId={mediaSourceId ?? undefined}
     initialPosition={videoInitialPosition}
     needsTranscoding={videoNeedsTranscoding}
     onClose={handleClose}