Split prompts into pre/prompt/post and tidy the AIGen video form.

Keep wrappers off the library mid-prompt so Use as input and Extend restore the same split, send stills to xAIGen as hidden inputs, and stop the two-column library from growing with the list.

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

pages/library.vue

@@ -271,6 +271,13 @@
               :disabled="keepingInputBusy"
               @click="saveFocusedAsInput"
             >{{ keepingInputBusy ? 'Saving…' : 'Save as input' }}</button>
+            <button
+              v-if="focused.kind === 'still' && backupStudioEnabled"
+              type="button"
+              class="rounded-full border border-white/10 px-3 py-1.5 text-xs text-zinc-300 hover:text-white"
+              :disabled="backupBusy"
+              @click="sendFocusedToBackup"
+            >{{ backupBusy ? 'Sending…' : 'Send to Backup on AIGen only' }}</button>
             <a
               v-if="downloadHref"
               :href="downloadHref"
@@ -375,6 +382,8 @@ const filterOptions = [
 
 const runtimeConfig = useRuntimeConfig()
 const instanceName = ref(String(runtimeConfig.public.instanceName || 'AIGen'))
+const backupStudioEnabled = computed(() => Boolean(runtimeConfig.public.backupStudioEnabled))
+const backupBusy = ref(false)
 const showPrivacyToggles = computed(() => isXaigenStudio({
   studio: runtimeConfig.public.studio,
   instanceName: runtimeConfig.public.instanceName || instanceName.value
@@ -762,6 +771,20 @@ function useInStudio(entry: LibraryEntry) {
   }
 }
 
+async function sendFocusedToBackup() {
+  const still = focusedStill.value
+  if (!still || !backupStudioEnabled.value || backupBusy.value) return
+  backupBusy.value = true
+  try {
+    await $fetch(`/api/library/stills/${still.id}/backup`, { method: 'POST' })
+    toast('Sent to Backup as a hidden input.')
+  } catch (error: any) {
+    toast(error?.data?.statusMessage || 'Could not send that still to Backup')
+  } finally {
+    backupBusy.value = false
+  }
+}
+
 async function saveFocusedAsInput() {
   const still = focusedStill.value
   if (!still || keepingInputBusy.value) return