Fix UI bugs: input modal, node preview, LLM proposal display
- Remove warning banner from InputEditModal; move Force Input toggle
outside widget config block so it stays accessible when enabled;
hide widget config entirely when Force Input is on - Fix set_identity mutating original node object in applyOperations,
causing "0 valid changes" display bug before proposal accept - Remove category from NodePreviewTab title bar
- Fix MockText: remove hardcoded fallback text, add proper height to
single-line string fields - Move WILL CHANGE / WILL DELETE badges inline next to input name
instead of floating over the trash button