Add recent release changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on Keep a Changelog,
+and this project does not follow Semantic Versioning, here's what we do instead:
+
+Major version bumps are very rare and we reserve them for special changes that signify a paradigm shift of some kind.
+
+Minor version bumps are released on a regular cadence.
+
+Patch version bumps are for bugfixes and hotfixes.
+
+## [1.8.1] - 2026-06-28
+
+### Fixed
+
+- Weekly note navigation placement - Navigation buttons now render after Roam's title display container instead of inside the title DOM.
+- Intermittent weekly note buttons - Weekly note navigation now renders from the title observer so buttons appear when Roam loads the title after hash navigation.
+- Sidebar title cleanup - Removing a right-sidebar page title no longer clears the main weekly note navigation.
+
+### Changed
+
+- Weekly note navigation controls - The controls now render as a React component using Blueprint buttons and Tailwind layout classes.
+
+## [1.8.0] - 2026-06-28
+
+### Added
+
+- SmartBlocks weekly note templates - Weekly note templates now render through SmartBlocks when the SmartBlocks extension is installed and enabled.
+- Dynamic weekly note prompts - SmartBlocks commands can now be used in weekly note templates for dynamic dates and other template behavior.
+
+### Changed
+
+- SmartBlocks detection - Weekly notes now check Roam Depot installation metadata before waiting for SmartBlocks to load.
+- RoamJS Components dependency - WorkBench now uses the updated `roamjs-components` package with current Roam Depot API typings.