Update changelog for upcoming release

Add Mac App Store release pipeline, reactive popup updates, and
improve no data messaging. Move release documentation to dedicated
file for clearer project structure and easier reference.

Author: bartTC

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 
+## [Unreleased]
+
+### Added
+- Mac App Store release pipeline (`just archive-appstore`, `just upload-appstore`)
+- Release documentation moved to dedicated RELEASE.md
+
+### Changed
+- Popup now uses reactive updates via port connection (no more polling)
+- "No Data" message now says "Navigate or reload to capture headers" instead of "No CDN headers found"
+
 ## [v0.0.6] - 2026-01-05
 
 ### Changed