Add a dynamic-preview engine alongside slab's PDF/video viewers, rendered by the AC Electron app: - ac-electron: '--preview <url>' opens a frameless window for any URL/path (cold-launch + second-instance routing; re-request focuses). Always appends a local --remote-debugging-port=9222 so every preview is a CDP target. preview-preload.js makes the frameless body click-drag to move (4px threshold so a tap still passes through to the content). - slab/bin/slab-web: opens a URL/path/$code as a preview via the AC app. - SlabMenubar AXTiler: include computer.aesthetic.app windows in the tile pass so previews pack into the same grid as Terminal/iTerm. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>