The per-scene prompt preview mirrors what Studio encodes, and the postfix is
appended to every scene at generation — so it belongs there. Surface it once
after the scenes as a 'postfix' badge, symmetric to the 'anchor' badge shown
once above them.
- bridge.expand_prompt_fragment: expands a standalone fragment (anchor/postfix)
the same way generation does, so the previewed text matches exactly.
- server preview: result["postfix"] = expanded effective_postfix(p).
- inspector: postfix badge line; _promptPreviewKey includes postfix so editing
it refreshes the preview live.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
