fix(anilist): decode array-shaped airingSchedule/relations and isolate per-service sync errors

The 1.6.1 fix exposed a latent decoding bug: AniList returns
airingSchedule.nodes and relations.nodes as arrays, but the Go Media
struct declared Nodes as single structs. Every full-media response
failed json.Unmarshal partway through - the update path turned that
into a rejected promise which skipped the MAL and Simkl syncs and all
table updates, while page loads silently continued with partially
decoded data (the reason the old tags/genres copy workaround existed).

- Media.AiringSchedule.Nodes is now []AiringScheduleNode and
  Media.Relations is an exported []MediaRelation (previously an
  unexported field silently dropped by encoding/json); title and
  fuzzy-date sub-structs promoted to named types.
- Regenerate wailsjs models for the new shapes.
- Anime.svelte: handleSubmit and deleteEntries now wrap each service
  in its own try/catch surfaced via setApiError/ErrorModal, so one
  service failing can no longer skip the others; removed the obsolete
  tags/genres copy workaround.
- AniListUpdateEntry/AniListDeleteEntry log HTTP status and response
  body on failure for terminal diagnostics.

Bump productVersion to 1.6.2.

frontend/src/helperComponents/Anime.svelte

@@ -217,10 +217,6 @@
             );
             return;
           }
-          value.data.MediaList.media.tags =
-            currentAniListAnime.data.MediaList.media.tags;
-          value.data.MediaList.media.genres =
-            currentAniListAnime.data.MediaList.media.genres;
           aniListAnime.update((newValue) => {
             newValue = value;
             return newValue;
@@ -243,7 +239,18 @@
           });
         });
       }
+    } catch (error) {
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error submitting AniList changes:", error);
+      setApiError(
+        "anilist",
+        `Failed to sync AniList: ${errorMsg}`,
+        undefined,
+        true,
+      );
+    }
 
+    try {
       if (malLoggedIn && currentMalAnime.id !== 0) {
         let body: MALUploadStatus = {
           status: submitData.status.mal,
@@ -296,7 +303,18 @@
           },
         );
       }
+    } catch (error) {
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error submitting MyAnimeList changes:", error);
+      setApiError(
+        "mal",
+        `Failed to sync MyAnimeList: ${errorMsg}`,
+        undefined,
+        true,
+      );
+    }
 
+    try {
       if (simklLoggedIn && currentSimklAnime.show.ids.simkl !== 0) {
         if (currentSimklAnime.watched_episodes_count !== submitData.episodes) {
           await SimklSyncEpisodes(currentSimklAnime, submitData.episodes).then(
@@ -369,13 +387,19 @@
         }
       }
     } catch (error) {
-      console.error("Error submitting changes:", error);
-    } finally {
-      submitting.set(false);
-      submitSuccess.set(true);
-      watchlistNeedsRefresh.set(true);
-      setTimeout(() => submitSuccess.set(false), 2000);
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error submitting Simkl changes:", error);
+      setApiError(
+        "simkl",
+        `Failed to sync Simkl: ${errorMsg}`,
+        undefined,
+        true,
+      );
     }
+    submitting.set(false);
+    submitSuccess.set(true);
+    watchlistNeedsRefresh.set(true);
+    setTimeout(() => submitSuccess.set(false), 2000);
   };
 
   const deleteEntries = async () => {
@@ -399,6 +423,18 @@
           notes: "",
         });
       }
+    } catch (error) {
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error deleting AniList entry:", error);
+      setApiError(
+        "anilist",
+        `Failed to delete AniList entry: ${errorMsg}`,
+        undefined,
+        true,
+      );
+    }
+
+    try {
       if (malLoggedIn && currentMalAnime.id !== 0) {
         await DeleteMyAnimeListEntry(currentMalAnime.id);
         AddAnimeServiceToTable({
@@ -414,6 +450,18 @@
           notes: "",
         });
       }
+    } catch (error) {
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error deleting MyAnimeList entry:", error);
+      setApiError(
+        "mal",
+        `Failed to delete MyAnimeList entry: ${errorMsg}`,
+        undefined,
+        true,
+      );
+    }
+
+    try {
       if (simklLoggedIn && currentSimklAnime.show.ids.simkl !== 0) {
         await SimklSyncRemove(currentSimklAnime);
         AddAnimeServiceToTable({
@@ -430,13 +478,19 @@
         });
       }
     } catch (error) {
-      console.error("Error deleting entries:", error);
-    } finally {
-      submitting.set(false);
-      submitSuccess.set(true);
-      watchlistNeedsRefresh.set(true);
-      setTimeout(() => submitSuccess.set(false), 2000);
+      const errorMsg = error instanceof Error ? error.message : String(error);
+      console.error("Error deleting Simkl entry:", error);
+      setApiError(
+        "simkl",
+        `Failed to delete Simkl entry: ${errorMsg}`,
+        undefined,
+        true,
+      );
     }
+    submitting.set(false);
+    submitSuccess.set(true);
+    watchlistNeedsRefresh.set(true);
+    setTimeout(() => submitSuccess.set(false), 2000);
   };
 
   let max = 999;