docs(changelog): add 0.9.2 and 0.9.3 notes

Author: benvinegar

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Fixed
+
+## [0.9.3] - 2026-04-13
+
+### Fixed
+
+- Normalize rename-only diff paths so pure renames keep one clean `old/path -> new/path` header in the review UI.
+- Strip Pierre's empty-line newline placeholder spans so blank additions and deletions keep stable line numbers and diff row backgrounds.
+
+## [0.9.2] - 2026-04-11
+
+### Fixed
+
+- Fix a bottom-edge scrolling regression where short last files could snap back and make upward navigation feel stuck near the end of the review stream.