i did a lot f things and small bug patches too and this a new sub version btw

What changedSticky preview panel styling for the desktop two-column layout, with the mobile override kept static below the 900px breakpoint.

Theme swatches now appear with small labels underneath each color.Each form section now has a collapse/expand toggle, and the state is saved in localStorage.

A “Missing: …” counter now appears beside the progress bar and updates from the same progress logic.Added “Copy as JSON” and “Import JSON” actions with validation and toast feedback.

Theme switching now uses smoother crossfade-like transitions across the main UI surfaces.