While launching the `code` webview, a prompt shouldn't be shown

[ELLIOTTCABLE]

Checklist

• [x] Using latest version on the App Store
• [x] Read the docs
• [x] Searched for existing GitHub issues

Describe the bug

When opening a code instance, there's a long pause after hitting "return", during which a prompt is shown below the 'hit return to open the webview' comment.

This slightly implies the action has failed somehow, and tempts the user to type another command.

Ideally, a blink> prompt shouldn't be shown while the webview is launching.

[carloscabanero]

Yep, we will come up with a better way to display this.