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/symfony/var-exporter/CHANGELOG.md

@@ -0,0 +1,42 @@
+CHANGELOG
+=========
+
+7.4
+---
+
+ * Add support for exporting named closures
+
+7.3
+---
+
+ * Deprecate using `ProxyHelper::generateLazyProxy()` when native lazy proxies can be used - the method should be used to generate abstraction-based lazy decorators only
+ * Deprecate `LazyGhostTrait` and `LazyProxyTrait`, use native lazy objects instead
+ * Deprecate `ProxyHelper::generateLazyGhost()`, use native lazy objects instead
+
+7.2
+---
+
+ * Allow reinitializing lazy objects with a new initializer
+
+6.4
+---
+
+ * Deprecate per-property lazy-initializers
+
+6.2
+---
+
+ * Add support for lazy ghost objects and virtual proxies
+ * Add `Hydrator::hydrate()`
+ * Preserve PHP references also when using `Hydrator::hydrate()` or `Instantiator::instantiate()`
+ * Add support for hydrating from native (array) casts
+
+5.1.0
+-----
+
+ * added argument `array &$foundClasses` to `VarExporter::export()` to ease with preloading exported values
+
+4.2.0
+-----
+
+ * added the component