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/Conditionable.php

@@ -0,0 +1,26 @@
+<?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;
+
+interface Conditionable
+{
+    /**
+     * Apply the callback if the given "condition" is (or resolves to) true.
+     *
+     * @param (callable(static): bool)|bool $condition
+     * @param callable(static): (static|null) $onSuccess
+     * @param ?callable(static): (static|null) $onFail
+     */
+    public function when(callable|bool $condition, callable $onSuccess, ?callable $onFail = null): static;
+}