Improved ability to add block into page frame by showing dropzones on-hover during add block mode

Clicking on "add another item" now duplicate styles

Holding mouse wheel now act as panning (holding space and moving)

Fixed Bold button in WYSIWYG rendering text as font-weight: bold in canvas, but as font-weight: bolder in preview

Fixed Increment / decrement values with arrow keys not working

Fixed email notification having wrong username in the message preview