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.

AniListTypes.go

@@ -64,74 +64,43 @@ type AniListUpdateReturn struct {
 }
 
 type Media struct {
-	ID    int `json:"id"`
-	IDMal int `json:"idMal"`
-	Title struct {
-		UserPreferred string `json:"userPreferred"`
-		Romaji        string `json:"romaji"`
-		English       string `json:"english"`
-		Native        string `json:"native"`
-	} `json:"title"`
-	Description string `json:"description"`
+	ID          int        `json:"id"`
+	IDMal       int        `json:"idMal"`
+	Title       MediaTitle `json:"title"`
+	Description string     `json:"description"`
 	CoverImage  struct {
 		ExtraLarge string
 		Large      string `json:"large"`
 		Medium     string
 		Color      string
 	} `json:"coverImage"`
-	BannerImage     string
-	Format          string
-	Season          string `json:"season"`
-	SeasonYear      int    `json:"seasonYear"`
-	Status          string `json:"status"`
-	Episodes        int    `json:"episodes"`
-	Duration        int
-	CountryOfOrigin string
-	Source          string
-	Synonyms        []string
-	AverageScore    int
-	MeanScore       int
-	Popularity      int
-	Trending        int
-	Favourites      int
-	isFavourite     bool
-	Relations       struct {
-		nodes struct {
-			id    int
-			Title struct {
-				UserPreferred string `json:"userPreferred"`
-				Romaji        string `json:"romaji"`
-				English       string `json:"english"`
-				Native        string `json:"native"`
-			} `json:"title"`
-		}
-	}
-	StartDate struct {
-		Year  int
-		Month int
-		Day   int
-	}
-	EndDate struct {
-		Year  int
-		Month int
-		Day   int
-	}
+	BannerImage       string
+	Format            string
+	Season            string `json:"season"`
+	SeasonYear        int    `json:"seasonYear"`
+	Status            string `json:"status"`
+	Episodes          int    `json:"episodes"`
+	Duration          int
+	CountryOfOrigin   string
+	Source            string
+	Synonyms          []string
+	AverageScore      int
+	MeanScore         int
+	Popularity        int
+	Trending          int
+	Favourites        int
+	isFavourite       bool
+	Relations         MediaRelations `json:"relations"`
+	StartDate         MediaFuzzyDate `json:"startDate"`
+	EndDate           MediaFuzzyDate `json:"endDate"`
 	NextAiringEpisode struct {
 		AiringAt        int `json:"airingAt"`
 		TimeUntilAiring int `json:"timeUntilAiring"`
 		Episode         int `json:"episode"`
 	} `json:"nextAiringEpisode"`
-	AiringSchedule struct {
-		Nodes struct {
-			Id              int
-			AiringAt        int
-			TimeUntilAiring int
-			Episode         int
-			MediaId         int
-		}
-	}
-	Genres []string `json:"genres"`
-	Tags   []struct {
+	AiringSchedule MediaAiringSchedule `json:"airingSchedule"`
+	Genres         []string            `json:"genres"`
+	Tags           []struct {
 		Id             int    `json:"id"`
 		Name           string `json:"name"`
 		Description    string `json:"description"`
@@ -142,6 +111,40 @@ type Media struct {
 	IsAdult bool `json:"isAdult"`
 }
 
+type MediaTitle struct {
+	UserPreferred string `json:"userPreferred"`
+	Romaji        string `json:"romaji"`
+	English       string `json:"english"`
+	Native        string `json:"native"`
+}
+
+type MediaRelations struct {
+	Nodes []MediaRelation `json:"nodes"`
+}
+
+type MediaRelation struct {
+	Id    int        `json:"id"`
+	Title MediaTitle `json:"title"`
+}
+
+type MediaFuzzyDate struct {
+	Year  int `json:"year"`
+	Month int `json:"month"`
+	Day   int `json:"day"`
+}
+
+type MediaAiringSchedule struct {
+	Nodes []AiringScheduleNode `json:"nodes"`
+}
+
+type AiringScheduleNode struct {
+	Id              int `json:"id"`
+	AiringAt        int `json:"airingAt"`
+	TimeUntilAiring int `json:"timeUntilAiring"`
+	Episode         int `json:"episode"`
+	MediaId         int `json:"mediaId"`
+}
+
 type MediaList struct {
 	ID        int    `json:"id"`
 	MediaID   int    `json:"mediaId"`