docs: update analytics changelog

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## [Frontend 0.9.0 / Backend 0.6.2] - 2026-08-19
+
+### Changed
+
+- Analytics now calculate net income and expenses by category type: refunds reduce the original expense category and internal transfers no longer affect P&L.
+- Added a separate cash-flow summary with incoming, outgoing, and transfer amounts.
+- Added unit and transactional SQL checks for analytics calculations.
+
 ## [0.8.7] - 2026-08-16
 
 ### Changed