Store the Edit TextEncode prompt on library stills, not a Start still caption.

Edit + Enhance always leads with the keep/<image1> stanza and typed change; PE describe dumps are dropped, and Typed stays promptRaw.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/studio2/Bench.vue

@@ -656,9 +656,10 @@ function applyUseAsHero(){
  uploadMessage.value=`Using ${assetLabel(selected.value)} as hero.`
 }
 async function copySelectedPrompt(){
- const text=selected.value?.studio2?.promptSections?.action
+ const text=selected.value?.studio2?.prompt
   || selected.value?.studio2?.compiledPrompt
   || selected.value?.prompt
+  || selected.value?.studio2?.promptSections?.action
   || ''
  try{
   if(import.meta.client && navigator.clipboard)await navigator.clipboard.writeText(String(text||''))