Skeleton event handler for canvas clicks.
First take at addCard().
Create cards with textarea and delete button.
Moved delete event handling into addCard().
Removed commented code.
Removed hack that hid delete buttons on preinitialized cards.
Moved misc textarea and card hover events to addCard.
Moved textarea auto-adjusting to addCard().
Give focus to textarea on card creation.
Initialize card with hidden delete button.
Code organization.
Added red fill when hovering over delete button.
Animated card deletion.
Added cursor to hint card draggability.
Show open hand cursor when hovering over card's draggable area.
De-focus textarea when card drag starts.
Supress delete button while dragging.
Animate addCard().
Match add and delete animation speeds.
Reduce canvas scrolling when newly created card crosses window.