Automatically hide "View Panel" notification after refocusing Zed (#27512)

Now if you refocus Zed manually (e.g. cmd-tab), we hide the "View Panel"
notification automatically.

This also fixes a related subscription leak.

Release Notes:

- N/A
7537f0557fRichard Feldman committed on 3/27/2025, 10:20:45 PM· committed by GitHubparent85740dd
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