refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/sebastian/exporter/ChangeLog.md

@@ -0,0 +1,67 @@
+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
+
+## [4.0.8] - 2025-09-24
+
+### Changed
+
+* Suppress `unexpected NAN value was coerced to string` warning triggered on PHP 8.5
+
+## [4.0.7] - 2025-09-22
+
+### Changed
+
+* Suppress `not representable as an int, cast occurred` warning triggered on PHP 8.5
+
+## [4.0.6] - 2024-03-02
+
+### Changed
+
+* Do not use implicitly nullable parameters
+
+## [4.0.5] - 2022-09-14
+
+### Fixed
+
+* [#47](https://github.com/sebastianbergmann/exporter/pull/47): Fix `float` export precision
+
+## [4.0.4] - 2021-11-11
+
+### Changed
+
+* [#37](https://github.com/sebastianbergmann/exporter/pull/37): Improve export of closed resources
+
+## [4.0.3] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [4.0.2] - 2020-06-26
+
+### Added
+
+* This component is now supported on PHP 8
+
+## [4.0.1] - 2020-06-15
+
+### Changed
+
+* Tests etc. are now ignored for archive exports
+
+## [4.0.0] - 2020-02-07
+
+### Removed
+
+* This component is no longer supported on PHP 7.0, PHP 7.1, and PHP 7.2
+
+[4.0.8]: https://github.com/sebastianbergmann/exporter/compare/4.0.7...4.0.8
+[4.0.7]: https://github.com/sebastianbergmann/exporter/compare/4.0.6...4.0.7
+[4.0.6]: https://github.com/sebastianbergmann/exporter/compare/4.0.5...4.0.6
+[4.0.5]: https://github.com/sebastianbergmann/exporter/compare/4.0.4...4.0.5
+[4.0.4]: https://github.com/sebastianbergmann/exporter/compare/4.0.3...4.0.4
+[4.0.3]: https://github.com/sebastianbergmann/exporter/compare/4.0.2...4.0.3
+[4.0.2]: https://github.com/sebastianbergmann/exporter/compare/4.0.1...4.0.2
+[4.0.1]: https://github.com/sebastianbergmann/exporter/compare/4.0.0...4.0.1
+[4.0.0]: https://github.com/sebastianbergmann/exporter/compare/3.1...4.0.0