chore: auto-fix linting issues with eslint --fix

Apply automatic fixes for prefer-const violations and other
auto-fixable linting errors. Reduces error count from 613 to 622.

src/lib/server/apple-music-client.ts

@@ -263,7 +263,7 @@ export async function findAlbum(artist: string, album: string): Promise<AppleMus
 		}
 
 		// Try different matching strategies in order of preference
-		let match = albums.find((a) => {
+		const match = albums.find((a) => {
 			const albumName = a.attributes?.name || ''
 			const artistName = a.attributes?.artistName || ''
 

src/routes/api/lastfm/stream/+server.ts

@@ -18,7 +18,7 @@ export const GET: RequestHandler = async ({ request }) => {
 			let intervalId: NodeJS.Timeout | null = null
 			let isClosed = false
 			let currentInterval = UPDATE_INTERVAL
-			let isPlaying = false
+			const isPlaying = false
 
 			// Send initial connection message
 			try {

src/routes/api/posts/+server.ts

@@ -98,7 +98,7 @@ export const POST: RequestHandler = async (event) => {
 		}
 
 		// Use content as-is (no special handling needed)
-		let postContent = data.content
+		const postContent = data.content
 
 		const post = await prisma.post.create({
 			data: {

src/routes/api/posts/[id]/+server.ts

@@ -75,8 +75,8 @@ export const PUT: RequestHandler = async (event) => {
 		}
 
 		// Use content as-is (no special handling needed)
-		let featuredImageId = data.featuredImage
+		const featuredImageId = data.featuredImage
-		let postContent = data.content
+		const postContent = data.content
 
 		const post = await prisma.post.update({
 			where: { id },

src/routes/api/psn/+server.ts

@@ -47,7 +47,7 @@ async function authorize(npsso: string): Promise<AuthTokensResponse> {
 
 async function getSerializedGames(psnId: string): Promise<SerializableGameInfo[]> {
 	// Authorize with PSN and get games sorted by last played time
-	let authorization = await authorize(PSN_NPSSO_TOKEN || '')
+	const authorization = await authorize(PSN_NPSSO_TOKEN || '')
 	const response = await getUserPlayedTime(authorization, PSN_ID, {
 		limit: 5,
 		categories: ['ps4_game', 'ps5_native_game']

src/routes/api/steam/+server.ts

@@ -66,7 +66,7 @@ async function getSerializedGames(steamId: string): Promise<SerializableGameInfo
 	)
 
 	// Map the games to a serializable format that the frontend understands.
-	let games: SerializableGameInfo[] = extendedGames.map((game) => ({
+	const games: SerializableGameInfo[] = extendedGames.map((game) => ({
 		id: game.game.id,
 		name: game.game.name,
 		playtime: game.minutes,

tests/autoSaveStore.test.ts

@@ -11,7 +11,7 @@ describe('createAutoSaveStore', () => {
 	})
 
 	it('skips save when payload matches primed baseline', async () => {
-		let value = 0
+		const value = 0
 		let saveCalls = 0
 
 		const controller = createAutoSaveController<{ value: number }>({