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/league/uri-interfaces/Contracts/UriComponentInterface.php

@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri\Contracts;
+
+use JsonSerializable;
+use Stringable;
+
+/**
+ * @method static when(callable|bool $condition, callable $onSuccess, ?callable $onFail = null) conditionally return a new instance
+ * @method bool equals(mixed $value) tells whether the submitted value is equal to the current instance value
+ */
+interface UriComponentInterface extends JsonSerializable, Stringable
+{
+    /**
+     * Returns the instance string representation.
+     *
+     * If the instance is defined, the value returned MUST be percent-encoded,
+     * but MUST NOT double-encode any characters. To determine what characters
+     * to encode, please refer to RFC 3986, Sections 2 and 3.
+     *
+     * If the instance is not defined null is returned
+     */
+    public function value(): ?string;
+
+    /**
+     * Returns the instance string representation.
+     *
+     * If the instance is defined, the value returned MUST be percent-encoded,
+     * but MUST NOT double-encode any characters. To determine what characters
+     * to encode, please refer to RFC 3986, Sections 2 and 3.
+     *
+     * If the instance is not defined, an empty string is returned
+     */
+    public function toString(): string;
+
+    /**
+     * Returns the instance string representation.
+     *
+     * If the instance is defined, the value returned MUST be percent-encoded,
+     * but MUST NOT double-encode any characters. To determine what characters
+     * to encode, please refer to RFC 3986, Sections 2 and 3.
+     *
+     * If the instance is not defined, an empty string is returned
+     */
+    public function __toString(): string;
+
+    /**
+     * Returns the instance json representation.
+     *
+     * If the instance is defined, the value returned MUST be percent-encoded,
+     * but MUST NOT double-encode any characters. To determine what characters
+     * to encode, please refer to RFC 3986 or RFC 1738.
+     *
+     * If the instance is not defined, null is returned
+     */
+    public function jsonSerialize(): ?string;
+
+    /**
+     * Returns the instance string representation with its optional URI delimiters.
+     *
+     * The value returned MUST be percent-encoded, but MUST NOT double-encode any
+     * characters. To determine what characters to encode, please refer to RFC 3986,
+     * Sections 2 and 3.
+     *
+     * If the instance is not defined, an empty string is returned
+     */
+    public function getUriComponent(): string;
+}