agent: Move focus to the panel after sending a user message edit (#33049)

Follow up to https://github.com/zed-industries/zed/pull/31611.
Closes https://github.com/zed-industries/zed/issues/33005.

Release Notes:

- agent: Fixed a bug where, after confirming editing a previous user
message while zoomed in, the focus went to the buffer and the panel got
closed.
5c7e90d494Danilo Leal committed on 6/19/2025, 5:38:37 PM· committed by GitHubparent61abfd5
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