Add a keyboard shortcut to cancel editing title

[Geeyun-JY3]

Add a keyboard shortcut to cancel editing title (e.g. esc, just like #961 when editing a comment).

[fregante]

This is a super simple feature, could you send a PR? Can be named generically esc-to-cancel. There’s another similar feature as well, but they’re different enough to be separate.

[Geeyun-JY3]

This is a super simple feature, could you send a PR?

I am not a coder. I know nothing about coding🤣.

I took the liberty of working on this ^^