chore: add changeset for v1.4.0 release (#581)

Author: Davidnet

.changeset/release-1-4-0.md

@@ -0,0 +1,7 @@
+---
+"kiji-privacy-proxy": minor
+---
+
+- Reworked the desktop UI and made the UI available in the Linux standalone version.
+- Bumped Electron to ^42.4.0 to fix binary extraction on Node 24.
+- `make electron-dev` now verifies and announces dev-server reuse.