Faster recovery and clearer slide positioning

Saved designs and editor routes now distinguish loading failures from an empty library and offer a clearer retry path. The editor also preserves recoverable local changes when navigation interrupts a save, and it avoids replacing newer saved work without warning.

The new Layers panel helps select text, images, cards, and supported nested Remix content when elements overlap. On-canvas positioning now supports multi-selection, alignment to slide margins, tidy group placement, duplication, deletion, and more predictable zooming and recentring.

Brand and media editing also received a consistency pass: website imports validate readable public pages, previews use real carousel treatments, brand fonts reach supported rich text, and filled CTA text keeps readable contrast.