Fix `tab` keybinding to for Squint Mode

Fix `tab` keybinding to switch modes

Add rel="noopener noreferrer" to all target="_blank" links in index.html

:shower: Cleanup typo

:memo: Switch to recommended keybinding

:fire: Remove some dead code

:white_check_mark: Add another squint mode test

Restore margin hack for multiple visible editors

Fix Classic mode's sizing with font changes

Honor selection mode with inversion

Fix squint mode's theming

:fire: Remove some dead fixture code

:shower: Cleanup

:recycle: DRY between word and chracters

:shower: Cleanup wordDecoration styling to match characters