refactored the main text area into a standalone class #1422
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I had been planning to try to add @-mentions of context files into the Inline Edits instructions dialog. This necessitates pulling the TextArea class out of EditCommandPrompt.
I've done that in this PR, but did not get the @-mentions done because it's a larger project than I had anticipated.
Test plan
No user-visible changes, and all automated & manual tests pass.