docs: add changelog file

Author: RMCampos

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](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [Unreleased]
+
+---
+
+## [app-v2026.06.01.20] - 2026-06-01
+
+### Changed
+- Bumped backend and frontend dependencies to latest versions. (#61)
+
+---
+
+## [app-v2026.05.26.19] - 2026-05-26
+
+### Added
+- SDD and DDD specification files for AI-assisted development, including Spec 001 implementation. (#60)
+
+---
+
+## [app-v2026.05.19.18] - 2026-05-19
+
+### Changed
+- Auth session refresh now uses server-authoritative current user data instead of stale client state. (#59)
+
+---
+
+## [app-v2026.05.18.17] - 2026-05-18
+
+### Added
+- Last activity date/time is now tracked and displayed for tasks and notes. (#57)
+
+---
+
+## [app-v2026.05.17.16] - 2026-05-17
+
+### Added
+- Users must confirm their email address before they can log in. (#56)
+- Migrated app to new domain with Traefik redirect middleware. (#53)
+
+### Fixed
+- Mailgun authentication error (401) when sending emails. (#55)
+- New domain correctly allowed in CORS and CSP configuration. (#54)
+
+---
+
+## [app-v2026.05.13.15] - 2026-05-13
+
+### Changed
+- Dropped refresh token logic; auth now relies solely on short-lived access tokens, simplifying the session flow. (#51)
+
+---
+
+## [app-v2026.05.13.14] - 2026-05-13
+
+### Added
+- Cypress E2E tests covering Home, Task, and Notes management flows. (#46)
+- Cypress E2E tests for authentication flows. (#39)
+- Scheduled database backups. (#48)
+
+### Fixed
+- Premature route resolution before initial auth check completes. (#45)
+- Blocked inline styles in CSP via SHA-256 hash in `style-src`. (#43)
+- Frontend test warnings and errors. (#37)
+
+### Changed
+- Upgraded Vite to v8. (#35)
+
+---
+
+## [app-v2026.04.29.4] - 2026-04-29
+
+### Added
+- Gemini CLI commands and updated AI agent configuration.
+
+### Changed
+- Upgraded TypeScript to v6. (#34)
+
+---
+
+## [app-v2026.04.29.3] - 2026-04-29
+
+### Changed
+- Updated client dependencies to latest minor versions. (#33, #32)
+
+---
+
+## [app-v2026.04.16.1] - 2026-04-16
+
+### Added
+- Dev environment config files and scripts to run the app locally on VPS. (#29)
+
+### Security
+- Improved security posture and added protections against XSS attacks. (#30)
+
+---
+
+## [app-v2026.04.08.20] - 2026-04-08
+
+### Added
+- GitHub Actions workflow for building server candidate images.
+
+### Changed
+- Bumped Spring Boot to 4.0.5. (#27)
+
+---
+
+## [app-v2026.04.06.19] - 2026-04-06
+
+### Added
+- Kubernetes CD pipeline via GitHub Actions.
+- Dev container for Java development.
+- Workflow skips deployment when no source changes detected.
+
+---
+
+## [app-v2026.03.17.17] - 2026-03-17
+
+### Fixed
+- Missing email templates and configuration for new domain.
+
+---
+
+## [app-v2026.03.16.16] - 2026-03-16
+
+### Fixed
+- Backend memory leak and state management issues. (#23)
+- Error messages not propagating back to client in Spring v4.
+
+### Changed
+- Updated error messages and translations for improved user feedback.
+
+---
+
+## [app-v2026.02.28.15] - 2026-02-28
+
+### Added
+- Public note sharing: users can share a note via a public link. (#22)
+
+---
+
+## [app-v2026.02.27.13] - 2026-02-27
+
+### Added
+- Source and Copy buttons in the note markdown preview modal. (#21)
+
+### Changed
+- Upgraded backend to Spring Boot 4.0.3 and Java 25. (#20)
+
+---
+
+## [app-v2026.02.05.5] - 2026-02-05
+
+### Changed
+- Improved markdown rendering and added home filter context.
+- Added notes tags support throughout the app. (#13)
+- Tag suggestion dropdown for Notes and Tasks. (#12)
+
+### Fixed
+- Backend null pointer exception.
+- Filters now persist between actions in the Home view. (#9)
+
+---
+
+## [app-v2026.01.18.4] - 2026-01-18
+
+### Added
+- CI now uses GHCR (GitHub Container Registry) with unified version tagging for backend images.
+
+### Changed
+- Upgraded Spring Boot to 3.5.9.
+
+### Fixed
+- Docker image name casing issue causing deployment failures.
+
+---
+
+## [app-v2026.01.14.3] - 2026-01-14
+
+### Changed
+- Dropped Lombok dependency; bumped to Spring 3.5.9.
+- Updated backend dependencies to latest versions.
+
+---
+
+## [app-v2025.12.15.1] - 2025-12-15
+
+### Added
+- Initial release with core task and note management features.
+- Bruno API collections for local development.
+
+[Unreleased]: https://github.com/RMCampos/tasknote/compare/app-v2026.06.01.20...HEAD
+[app-v2026.06.01.20]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.26.19...app-v2026.06.01.20
+[app-v2026.05.26.19]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.19.18...app-v2026.05.26.19
+[app-v2026.05.19.18]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.18.17...app-v2026.05.19.18
+[app-v2026.05.18.17]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.17.16...app-v2026.05.18.17
+[app-v2026.05.17.16]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.13.15...app-v2026.05.17.16
+[app-v2026.05.13.15]: https://github.com/RMCampos/tasknote/compare/app-v2026.05.13.14...app-v2026.05.13.15
+[app-v2026.05.13.14]: https://github.com/RMCampos/tasknote/compare/app-v2026.04.29.4...app-v2026.05.13.14
+[app-v2026.04.29.4]: https://github.com/RMCampos/tasknote/compare/app-v2026.04.29.3...app-v2026.04.29.4
+[app-v2026.04.29.3]: https://github.com/RMCampos/tasknote/compare/app-v2026.04.16.1...app-v2026.04.29.3
+[app-v2026.04.16.1]: https://github.com/RMCampos/tasknote/compare/app-v2026.04.08.20...app-v2026.04.16.1
+[app-v2026.04.08.20]: https://github.com/RMCampos/tasknote/compare/app-v2026.04.06.19...app-v2026.04.08.20
+[app-v2026.04.06.19]: https://github.com/RMCampos/tasknote/compare/app-v2026.03.17.17...app-v2026.04.06.19
+[app-v2026.03.17.17]: https://github.com/RMCampos/tasknote/compare/app-v2026.03.16.16...app-v2026.03.17.17
+[app-v2026.03.16.16]: https://github.com/RMCampos/tasknote/compare/app-v2026.02.28.15...app-v2026.03.16.16
+[app-v2026.02.28.15]: https://github.com/RMCampos/tasknote/compare/app-v2026.02.27.13...app-v2026.02.28.15
+[app-v2026.02.27.13]: https://github.com/RMCampos/tasknote/compare/app-v2026.02.05.5...app-v2026.02.27.13
+[app-v2026.02.05.5]: https://github.com/RMCampos/tasknote/compare/app-v2026.01.18.4...app-v2026.02.05.5
+[app-v2026.01.18.4]: https://github.com/RMCampos/tasknote/compare/app-v2026.01.14.3...app-v2026.01.18.4
+[app-v2026.01.14.3]: https://github.com/RMCampos/tasknote/compare/app-v2025.12.15.1...app-v2026.01.14.3
+[app-v2025.12.15.1]: https://github.com/RMCampos/tasknote/releases/tag/app-v2025.12.15.1