fix: Fix Prettier formatting issues

[markdalgleish]

This PR applies the following fixes:

• Maintain undo history after formatting.
• Support formatting within undocked editor.
• Format current editor value, not last rendered code.

Why were these issues happening?

• We update the key for the editor when formatting, which causes a remount. This means we're actually rendering an entirely new editor without any undo history.
• We attach the keyboard shortcut to the window, but not to the new window that gets opened when undocking the editor.
• We were debouncing the code state update, which means that any attempt to read the current editor value was actually reading a snapshot of the last committed code, not necessarily what the user had most recently typed.