Zed AI v1.5.4 release notes

What the release notes say

Fix crash that could occur when unsplitting a side by side diff view (#58695)
acp: Fix for certain ACP Registry agent downloads not starting (#58633)
Update both editor: go to diagnostic and editor: go to previous diagnostic to prefer activating the diagnostic under the cursor before jumping to the next or previous diagnostic, respectively (#58603)
Fixed high CPU usage when using Zeta in some cases (thanks @clupprich!) (#58591)
Fixed a crash that could occur while streaming agent edits containing multibyte characters. (#58452)
Fixed an issue where Zed would stop responding to file system changes in some cases (#58692