Restore pre-text and post-text with Use as input and Details.

Library items already stored those fields, but Details showed one blob and Use as input left the form's empty pre/post in place.

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

server/utils/library.ts

@@ -1312,7 +1312,10 @@ export async function keepStillAsInput(owner: string, id: string) {
     height: still.height,
     hideInput: still.hideInput,
     role: 'input',
-    name
+    name,
+    prompt: still.prompt,
+    promptPre: still.promptPre,
+    promptPost: still.promptPost
   })
   if (!saved) throw createError({ statusCode: 400, statusMessage: 'Could not save that still as input' })
   return saved