Fix tests and add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased] - 2026-01-04
+
+### Fixed
+- **Tests**: Fixed Playwright drag-and-drop tests to work with dynamically generated note IDs
+  - Changed selectors from hardcoded text (`text=Note 1`) to flexible attribute selectors (`[data-draggable="true"]`)
+  - Updated matchers from `toContain('Note')` to regex patterns `toMatch(/Note \d+/)` to handle unique IDs with timestamps
+  - Replaced UI-based cleanup with API-based cleanup using `request.delete()` for more reliable test cleanup
+
+### Database
+- Cleaned up 38 accumulated test notes from the database using MCP memento tool
+- Retained only essential notes: "test" and 2x "New AI Framework Released"
+
+### Technical Details
+- The drag-and-drop functionality itself was working correctly
+- The issue was in the Playwright tests which expected exact text matches but notes were created with unique IDs (e.g., `test-1767557327567-Note 1`)
+- Tests now properly handle the dynamic note generation system
+
+## [Previous Versions]
+
+See individual commit history for earlier changes.