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/phpdocumentor/reflection/phpstan.neon

@@ -0,0 +1,21 @@
+parameters:
+    paths:
+      - src
+
+    level: max
+    ignoreErrors:
+
+        - '#Method phpDocumentor\\Reflection\\File\\LocalFile::md5\(\) should return string but returns string\|false\.#'
+        #
+        # all these $fqsen errors indicate the need for a decorator class around PhpParser\Node to hold the public $fqsen that Reflection is giving it)
+        #
+        # src/phpDocumentor/Reflection/NodeVisitor/ElementNameResolver.php
+        - '#Method phpDocumentor\\Reflection\\Php\\Factory\\(.*)::getFqsen\(\) should return phpDocumentor\\Reflection\\Fqsen but returns mixed\.#'
+        - '#Parameter \#1 \$fqsen of class phpDocumentor\\Reflection\\Php\\(.*) constructor expects phpDocumentor\\Reflection\\Fqsen, mixed given\.#'
+        - '#Parameter \#1 \$fqsen of method phpDocumentor\\Reflection\\Php\\File::addNamespace\(\) expects phpDocumentor\\Reflection\\Fqsen, mixed given\.#'
+        #
+        # Type hint in php-parser is incorrect.
+        - '#Cannot cast PhpParser\\Node\\Expr\|string to string.#'
+
+        - '#Parameter \#2 \$object of method phpDocumentor\\Reflection\\Php\\ProjectFactoryStrategy::matches\(\) expects object, mixed given.#'
+        - '#Method phpDocumentor\\Reflection\\Php\\ValueEvaluator\\ConstantEvaluator::evaluate\(\) should return string but returns mixed.#'