- New '내용 채우기' tab with full JSON template import workflow
- Load Builder JSON (slim or full) → parse ROOT/SECTION/VALUE tree
- Render form: each SECTION as a card, VALUE nodes as input fields
(string → textarea, other types → input)
- Nested sections auto-indent with accent left-border via CSS
- Real-time text/JSON preview as values are typed
- Copy button for filled text or filled JSON output
- fillerToText() mirrors toText() logic using stored FV values
- fillerToJSON() reconstructs full JSON with FV values substituted
- Escape key + backdrop click close filler import modal
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>