Keep the extension prompt editable while the last frame loads.

The box was disabled for last-frame extract and a stuck videoBusy flag, so typing died after a finished job.

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

pages/index.vue

@@ -534,7 +534,6 @@
               placeholder="Motion prompt for this extension…"
               :keep-items="keepPrompts.video"
               keep-heading="Video prompts"
-              :disabled="videoBusy"
             />
             <DurationField v-model="item.duration" class="mt-3" label="Duration" />
             <LoraSelect
@@ -1413,7 +1412,7 @@
                 {{ lastFrameLoading ? 'Reading last frame…' : 'Last frame preview unavailable' }}
               </p>
             </div>
-            <label class="block text-sm">
+            <div class="block text-sm">
               <span class="mb-1 block text-zinc-400">Extension prompt</span>
               <PromptField
                 v-model="extendPrompt"
@@ -1422,10 +1421,9 @@
                 placeholder="Continue the motion from this frame…"
                 :keep-items="keepPrompts.video"
                 keep-heading="Video prompts"
-                :disabled="lastFrameLoading || videoBusy"
                 textarea-class=""
               />
-            </label>
+            </div>
             <DurationField
               v-model="extendDuration"
               label="Extension duration"
@@ -5698,7 +5696,10 @@ async function loadLastFrame(id: string) {
   lastFrameLoading.value = true
   const gen = ++lastFrameGen
   try {
-    const blob = await $fetch<Blob>(`/api/library/clips/${id}/last-frame`, { responseType: 'blob' })
+    const blob = await $fetch<Blob>(`/api/library/clips/${id}/last-frame`, {
+      responseType: 'blob',
+      signal: AbortSignal.timeout(20_000)
+    })
     if (gen !== lastFrameGen) return
     if (lastFrameObjectUrl) URL.revokeObjectURL(lastFrameObjectUrl)
     lastFrameObjectUrl = URL.createObjectURL(blob)