Only show YouTube-enabled songs, exclude others from build

Filter SONGS export to only include songs with youtubeVideoId. All song
definitions remain in the source for future use. Vite plugin removes
non-YouTube song folders from dist after build so they aren't deployed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/features/song-select/song-data.ts

@@ -1,6 +1,6 @@
 import type { Song } from './types'
 
-export const SONGS: Song[] = [
+const ALL_SONGS: Song[] = [
   {
     id: 'get-lucky',
     title: 'Get Lucky',
@@ -374,3 +374,6 @@ export const SONGS: Song[] = [
     bannerUrl: '/songs/trap/bn.png',
   },
 ]
+
+/** Only songs with YouTube audio are shown in the UI. */
+export const SONGS: Song[] = ALL_SONGS.filter((s) => s.youtubeVideoId)

vite.config.ts

@@ -1,7 +1,28 @@
+import fs from 'fs'
+import path from 'path'
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import { SONGS } from './src/features/song-select/song-data'
+
+// Song folders to include in the build (only YouTube-enabled songs).
+// Other song folders stay in the repo but are excluded from dist.
+const activeSongIds = new Set(SONGS.map((s) => s.id))
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [
+    react(),
+    {
+      name: 'exclude-inactive-songs',
+      closeBundle() {
+        const songsDir = path.resolve(__dirname, 'dist/songs')
+        if (!fs.existsSync(songsDir)) return
+        for (const dir of fs.readdirSync(songsDir)) {
+          if (!activeSongIds.has(dir)) {
+            fs.rmSync(path.join(songsDir, dir), { recursive: true })
+          }
+        }
+      },
+    },
+  ],
 })