chore(release): release Buzz Desktop version 0.5.4 (#4562)

## Buzz Desktop release v0.5.4

- **Frozen main:** `6de85fe31d781122756aecf954bae7d357a56b9a`
- **Reviewed candidate:** `5836cb8f0af478ed3ee3bc6464a20fa4cc91303f`
- **Previous desktop release:** `desktop-v0.5.3`
- **Proposed immutable tag:** `desktop-v0.5.4`

This PR must be **squash merged** only after the Desktop Release
Candidate check passes. The branch must remain based directly on current
`main`; stale base, payload drift, incomplete notes, or an unauthorized
merge produce no tag.

The checked-in changelog accounts for every non-merge commit in the
release range. Publication remains bound to the immutable candidate tag.

Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Release Automation <release-automation@users.noreply.github.com>

.release/desktop-candidate.json

@@ -1,8 +1,8 @@
 {
   "schema": 1,
-  "version": "0.5.3",
-  "base_sha": "54c8ef30a9bb9c59a4415a8a7ee84c7c5454b48a",
-  "previous_tag": "v0.5.2",
-  "tag": "desktop-v0.5.3",
-  "commit_count": 58
+  "version": "0.5.4",
+  "base_sha": "6de85fe31d781122756aecf954bae7d357a56b9a",
+  "previous_tag": "desktop-v0.5.3",
+  "tag": "desktop-v0.5.4",
+  "commit_count": 40
 }