- Empty paragraph placeholder: "Press space for AI or / for commands". - Slash menu redesigned: compact items (icon + name + shortcut #/##/### on right), friendly group labels, 'Close menu (esc)' footer, 'Type to search' input at bottom, and hover preview card (e.g. 'Our Values' H2 sample). - Inline AI composer (AIC): space on empty block opens 'Edit with AI' pill; Enter -> agent generate with animated 'Brewing...' (stop button) -> framed markdown result + thumbs/thumbdown + 'Insert below' -> applyAIBlocks (md2b). - CSS: ai-pulse animation, .aici-result styles, .sm-* tweaks; app.css cache. - VERSION + app.main -> 5.1.2; CHANGELOG updated. - 271 tests pass (no regression); editor renders 200 (hint/menu/AIC present); JS validated via node --check.