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/expression-language/CHANGELOG.md

@@ -0,0 +1,46 @@
+CHANGELOG
+=========
+
+6.3
+---
+
+ * Add `enum` expression function
+ * Deprecate loose comparisons when using the "in" operator; normalize the array parameter
+   so it only has the expected types or implement loose matching in your own expression function
+
+6.2
+---
+
+ * Add support for null-coalescing syntax
+
+6.1
+---
+
+ * Add support for null-safe syntax when parsing object's methods and properties
+ * Add new operators: `contains`, `starts with` and `ends with`
+ * Support lexing numbers with the numeric literal separator `_`
+ * Support lexing decimals with no leading zero
+
+5.1.0
+-----
+
+ * added `lint` method to `ExpressionLanguage` class
+ * added `lint` method to `Parser` class
+
+4.0.0
+-----
+
+ * the first argument of the `ExpressionLanguage` constructor must be an instance
+   of `CacheItemPoolInterface`
+ * removed the `ArrayParserCache` and `ParserCacheAdapter` classes
+ * removed the `ParserCacheInterface`
+
+2.6.0
+-----
+
+ * Added ExpressionFunction and ExpressionFunctionProviderInterface
+
+2.4.0
+-----
+
+ * added the component