Landscape images (imported video frames, slide pages) would lose most of the picture in a 3:4 crop, so the tile keeps its monogram; portrait and near-square images (w/h <= 1.05) fade in over it, cropped from the centre. The header nav follows the mockup's segmented-control style: muted text, no underline, the current area raised in accent. Co-Authored-By: Claude Opus 5.5 <[email protected]>