Replace Comfy YuE with standalone YuEGP profile 1

utils/music.ts

@@ -104,9 +104,8 @@ export function countYueLyricSections(lyrics: unknown) {
 export function yueLyricsProblem(lyrics: unknown): string | null {
   const text = String(lyrics || '').trim()
   if (!text) return 'YuE needs lyrics with section tags like [Verse 1] and [Chorus].'
-  if (countYueLyricSections(text) < 1) {
-    return 'YuE lyrics must include at least one [Section] tag (use the chips under Lyrics).'
-  }
+  const sections = [...text.matchAll(/\[([^\]]+)\]\s*([^\[]*)/gs)].filter(match => match[2].trim())
+  if (sections.length !== 1) return 'YuEGP needs exactly one non-empty lyric section. Combine the lyrics under one heading.'
   return null
 }