Add 'View on Hover' to Category Notes for #563 (#579)

* add hover state to NotesButton

* switch NotesButton editability to a ternary

* fix new lines, adjust padding on textarea

* add workBreak to text styling

* Update packages/loot-design/src/components/NotesButton.js

Co-authored-by: Jed Fox <git@jedfox.com>

* change wordBreak to overflowWrap

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Co-authored-by: Jed Fox <git@jedfox.com>