Reworks the editor playground into a tabbed showcase:
- Rich text & blocks: drag-to-reorder handles, bubble/slash menus, and a live output panel (block/word counts, selection readout, document JSON).
- Multiplayer: two CRDT replicas synced over an in-memory channel with remote cursors, an in-sync indicator, and a Connected/Offline toggle that demonstrates divergence → convergence.
Also removes the focus outline on the contenteditable (outline: none on the editable surface).
robonen
53c725d3b2