fix(schedule): stop duplicating first page in season pagination

The seasonal schedule collector pushed page 1 outside the while-loop,
then re-pushed the current page on every loop iteration. That meant
every multi-page season duplicated its first page's media, and the
same bug ran a second time when includeLastSeason was set.

Restructure into a shared collectAllSchedulePages helper with a single
push-then-check-hasNextPage loop, so each page is pushed exactly once.

Verified against AniList for SPRING 2026 with includeLastSeason=true:
210 media, 0 duplicates.

1 files changed, 18 insertions, 37 deletions

diff --git a/src/lib/Data/AniList/schedule.ts b/src/lib/Data/AniList/schedule.ts
index eb70a03b..474f0e92 100644
--- a/src/lib/Data/AniList/schedule.ts
+++ b/src/lib/Data/AniList/schedule.ts
@@ -57,28 +57,32 @@ const schedulePage = async (
 
 type Season = "WINTER" | "SPRING" | "SUMMER" | "FALL";
 
-export const scheduleMediaListCollection = async (
+const collectAllSchedulePages = async (
 	year: number,
 	season: Season,
-	includeLastSeason = false,
+	into: SchedulePage["data"]["Page"]["media"],
 ) => {
-	const scheduledMedia = [];
 	let page = 1;
-	let currentPage = await schedulePage(page, year, season);
 
-	for (const candidate of currentPage.data.Page.media)
-		scheduledMedia.push(candidate);
+	while (true) {
+		const currentPage = await schedulePage(page, year, season);
 
-	while (currentPage["data"]["Page"]["pageInfo"]["hasNextPage"]) {
-		for (const candidate of currentPage.data.Page.media)
-			scheduledMedia.push(candidate);
+		for (const candidate of currentPage.data.Page.media) into.push(candidate);
+
+		if (!currentPage.data.Page.pageInfo.hasNextPage) break;
 
 		page += 1;
-		currentPage = await schedulePage(page, year, season);
 	}
+};
+
+export const scheduleMediaListCollection = async (
+	year: number,
+	season: Season,
+	includeLastSeason = false,
+) => {
+	const scheduledMedia: SchedulePage["data"]["Page"]["media"] = [];
 
-	for (const candidate of currentPage.data.Page.media)
-		scheduledMedia.push(candidate);
+	await collectAllSchedulePages(year, season, scheduledMedia);
 
 	if (includeLastSeason) {
 		const lastSeason = {
@@ -86,34 +90,11 @@ export const scheduleMediaListCollection = async (
 			SPRING: "WINTER",
 			SUMMER: "SPRING",
 			FALL: "SUMMER",
-		}[season];
+		}[season] as Season;
 
 		const lastSeasonYear = season === "WINTER" ? year - 1 : year;
 
-		let page = 1;
-		let currentPage = await schedulePage(
-			page,
-			lastSeasonYear,
-			lastSeason as Season,
-		);
-
-		for (const candidate of currentPage.data.Page.media)
-			scheduledMedia.push(candidate);
-
-		while (currentPage["data"]["Page"]["pageInfo"]["hasNextPage"]) {
-			for (const candidate of currentPage.data.Page.media)
-				scheduledMedia.push(candidate);
-
-			page += 1;
-			currentPage = await schedulePage(
-				page,
-				lastSeasonYear,
-				lastSeason as Season,
-			);
-		}
-
-		for (const candidate of currentPage.data.Page.media)
-			scheduledMedia.push(candidate);
+		await collectAllSchedulePages(lastSeasonYear, lastSeason, scheduledMedia);
 	}
 
 	return scheduledMedia as Partial<Media[]>;