While the `TextArea` used in the Rust TUI is "multiline," it is not like
an HTML `<textarea>` in that it does not wrap, so there was not much
benefit to setting `MIN_TEXTAREA_ROWS` to `3`, so this PR changes it to
`1`. Though there are now three ways to "increase" the height due to
actual linebreaks:
* paste in multiline content (this worked before this PR)
* pressing `Ctrl+J` will insert a newline
* if you have your terminal emulator set such that it is possible to
press something that `crossterm` interprets as "Enter plus some
modifier," then now that will also work
Now things look a bit more compact on startup:
<img width="745" alt="image"
src="https://github.com/user-attachments/assets/86e2857f-f31c-46f5-a80b-1ab2120b266e"
/>
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