* add super basic locking functionality * styled a lock state, added a lock icon to the toolbar * added block locking to non text blocks, add click icon on block to unlock, added state to the tooltip content of the toolbar lock button * removed button capability from the lock icon in the locked block, focused block when the toolbar lock icon is toggled * disabled inputs if locked * disable toolbar if locked * allow block keyboard handlers to work if text block is locked * prevent opening are you sure on locked blocks * add locking multiple selected blocks --------- Co-authored-by: celine <celine@hyperlink.academy>