fix(anilist): repair SaveMediaListEntry mutation and surface update failures

The AniListUpdateEntry mutation was mangled in 54c109a when the
standardized media field block was pasted in without the media { }
wrapper: media-level fields (idMal, title, ...) sat directly on
SaveMediaListEntry (which returns MediaList), the MediaList fields
(status, startedAt, ..., user) ended up at the Mutation root, and a
stray closing brace made the document a guaranteed 400. Because the
response status was discarded, the frontend received a zeroed
AniListGetSingleAnime and blanked the anime page after every submit,
making AniList appear logged out (and the change was never saved).

- Restore the mutation to match the tested bruno request: id/mediaId/
  userId, standard media block inside media { }, MediaList fields
  inside the selection, balanced braces.
- AniListUpdateEntry and AniListDeleteEntry now return an error on
  403/non-200/unparseable responses (mirroring
  GetAniListUserWatchingList) instead of silently returning zero
  values.
- Anime.svelte guards against replacing the page data with an empty
  response and raises the API error modal instead.

Bump productVersion to 1.6.1.

AniListFunctions.go

@@ -558,7 +558,7 @@ func (a *App) GetAniListUserWatchingList(page int, perPage int, sort string) (An
 	return post, nil
 }
 
-func (a *App) AniListUpdateEntry(updateBody AniListUpdateVariables) AniListGetSingleAnime {
+func (a *App) AniListUpdateEntry(updateBody AniListUpdateVariables) (AniListGetSingleAnime, error) {
 	body := struct {
 		Query     string                 `json:"query"`
 		Variables AniListUpdateVariables `json:"variables"`
@@ -584,84 +584,87 @@ func (a *App) AniListUpdateEntry(updateBody AniListUpdateVariables) AniListGetSi
     startedAt: $startedAt
     completedAt: $completedAt
   ) {
-  id
-  idMal
-  title {
-    userPreferred
-    romaji
-    english
-    native
-  }
-  description
-  coverImage {
-    extraLarge
-    large
-    medium
-    color
-  }
-  bannerImage
-  format
-  season
-  seasonYear
-  status
-  episodes
-  duration
-  countryOfOrigin
-  source
-  synonyms
-  averageScore
-  meanScore
-  popularity
-  trending
-  favourites
-  isFavourite
-  relations {
-    nodes {
+    id
+    mediaId
+    userId
+    media {
       id
+      idMal
       title {
         userPreferred
         romaji
         english
         native
       }
+      description
+      coverImage {
+        extraLarge
+        large
+        medium
+        color
+      }
+      bannerImage
+      format
+      season
+      seasonYear
+      status
+      episodes
+      duration
+      countryOfOrigin
+      source
+      synonyms
+      averageScore
+      meanScore
+      popularity
+      trending
+      favourites
+      isFavourite
+      relations {
+        nodes {
+          id
+          title {
+            userPreferred
+            romaji
+            english
+            native
+          }
+        }
+      }
+      startDate {
+        year
+        month
+        day
+      }
+      endDate {
+        year
+        month
+        day
+      }
+      nextAiringEpisode {
+        airingAt
+        timeUntilAiring
+        episode
+      }
+      airingSchedule {
+        nodes {
+          id
+          airingAt
+          timeUntilAiring
+          episode
+          mediaId
+        }
+      }
+      genres
+      tags {
+        id
+        name
+        description
+        rank
+        isMediaSpoiler
+        isAdult
+      }
+      isAdult
     }
-  }
-  startDate {
-    year
-    month
-    day
-  }
-  endDate {
-    year
-    month
-    day
-  }
-  nextAiringEpisode {
-    airingAt
-    timeUntilAiring
-    episode
-  }
-  airingSchedule {
-    nodes {
-      id
-      airingAt
-      timeUntilAiring
-      episode
-      mediaId
-    }
-  }
-  genres
-  tags {
-    id
-    name
-    description
-    rank
-    isMediaSpoiler
-    isAdult
-  }
-  isAdult
-}
-
     status
     startedAt {
       year
@@ -700,22 +703,51 @@ func (a *App) AniListUpdateEntry(updateBody AniListUpdateVariables) AniListGetSi
 		Variables: updateBody,
 	}
 
-	returnedBody, _ := AniListQuery(body, true)
+	returnedBody, status := AniListQuery(body, true)
+
+	var badPost struct {
+		Errors []struct {
+			Message   string `json:"message"`
+			Status    int    `json:"status"`
+			Locations []struct {
+				Line   int `json:"line"`
+				Column int `json:"column"`
+			} `json:"locations"`
+		} `json:"errors"`
+		Data any `json:"data"`
+	}
+
+	if status == "403 Forbidden" {
+		err := json.Unmarshal(returnedBody, &badPost)
+		if err != nil {
+			log.Printf("Failed at unmarshal, %s\n", err)
+			return AniListGetSingleAnime{}, fmt.Errorf("API authentication error")
+		}
+		return AniListGetSingleAnime{}, fmt.Errorf("AniList API error: %s", badPost.Errors[0].Message)
+	}
+	if status != "200 OK" {
+		return AniListGetSingleAnime{}, fmt.Errorf("API request failed with status: %s", status)
+	}
 
 	var returnedJson AniListUpdateReturn
 	err := json.Unmarshal(returnedBody, &returnedJson)
 	if err != nil {
 		log.Printf("Failed at unmarshal, %s\n", err)
+		return AniListGetSingleAnime{}, fmt.Errorf("failed to parse AniList update response")
+	}
+
+	if returnedJson.Data.SaveMediaListEntry.MediaID == 0 {
+		return AniListGetSingleAnime{}, fmt.Errorf("AniList returned no saved entry")
 	}
 
 	var post AniListGetSingleAnime
 
 	post.Data.MediaList = returnedJson.Data.SaveMediaListEntry
 
-	return post
+	return post, nil
 }
 
-func (a *App) AniListDeleteEntry(mediaListId int) DeleteAniListReturn {
+func (a *App) AniListDeleteEntry(mediaListId int) (DeleteAniListReturn, error) {
 	type Variables = struct {
 		Id int `json:"id"`
 	}
@@ -740,15 +772,40 @@ func (a *App) AniListDeleteEntry(mediaListId int) DeleteAniListReturn {
 		},
 	}
 
-	returnedBody, _ := AniListQuery(body, true)
+	returnedBody, status := AniListQuery(body, true)
+
+	var badPost struct {
+		Errors []struct {
+			Message   string `json:"message"`
+			Status    int    `json:"status"`
+			Locations []struct {
+				Line   int `json:"line"`
+				Column int `json:"column"`
+			} `json:"locations"`
+		} `json:"errors"`
+		Data any `json:"data"`
+	}
+
+	if status == "403 Forbidden" {
+		err := json.Unmarshal(returnedBody, &badPost)
+		if err != nil {
+			log.Printf("Failed at unmarshal, %s\n", err)
+			return DeleteAniListReturn{}, fmt.Errorf("API authentication error")
+		}
+		return DeleteAniListReturn{}, fmt.Errorf("AniList API error: %s", badPost.Errors[0].Message)
+	}
+	if status != "200 OK" {
+		return DeleteAniListReturn{}, fmt.Errorf("API request failed with status: %s", status)
+	}
 
 	var post DeleteAniListReturn
 	err := json.Unmarshal(returnedBody, &post)
 	if err != nil {
 		log.Printf("Failed at unmarshal, %s\n", err)
+		return DeleteAniListReturn{}, fmt.Errorf("failed to parse AniList delete response")
 	}
 
-	return post
+	return post, nil
 }
 
 func (a *App) AniListBrowse(

frontend/src/helperComponents/Anime.svelte

@@ -4,6 +4,7 @@
     aniListLoggedIn,
     malAnime,
     malLoggedIn,
+    setApiError,
     simklAnime,
     simklLoggedIn,
     watchlistNeedsRefresh,
@@ -207,6 +208,15 @@
           completedAt: convertDateToAniList(completedAtDate),
         };
         await AniListUpdateEntry(body).then((value: AniListGetSingleAnime) => {
+          if (!value.data?.MediaList || value.data.MediaList.mediaId === 0) {
+            setApiError(
+              "anilist",
+              "AniList update failed: no saved entry was returned",
+              undefined,
+              true,
+            );
+            return;
+          }
           value.data.MediaList.media.tags =
             currentAniListAnime.data.MediaList.media.tags;
           value.data.MediaList.media.genres =

wails.json

@@ -12,6 +12,6 @@
   },
   "info": {
     "productName": "AniTrack",
-    "productVersion": "1.5.5"
+    "productVersion": "1.6.1"
   }
 }