Auto-close & bracket matching
Typing ([{ or quotes inserts the closer, type-over to skip, wrap a selection, and Backspace clears an empty pair. The bracket beside the caret is highlighted with its match.
Typing (, [, {, ", ', or ` inserts the matching closer and keeps the caret between them. Type the closer when it’s already next to the caret and Editora types over it; type an opener with a selection and it wraps the selection; Backspace inside an empty pair deletes both halves.
Quotes aren’t auto-paired next to a word character, so the apostrophe in don't is left alone. And whenever the caret sits next to a bracket, both it and its match are highlighted.