Add Prompt Builder sets/framing and harden mobile draft look settings.

Sets and beats filter by shot size; scenes reorder/delete; portrait links Prompt Builder; landscape queue collapses; per-engine look settings and prompt Clear persist across iOS resumes.

server/api/prompt-sequences.post.ts

@@ -5,12 +5,14 @@ export default defineEventHandler(async (event) => {
   const body = await readBody<{
     name?: string
     characters?: unknown
+    sets?: unknown
     scenes?: unknown
     overwrite?: boolean
   }>(event).catch(() => ({}))
   const sequence = await savePromptSequence(owner, {
     name: body?.name || '',
     characters: body?.characters,
+    sets: body?.sets,
     scenes: body?.scenes,
     overwrite: body?.overwrite === true
   })