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/Exceptions/ConversionFailed.php

@@ -0,0 +1,51 @@
+<?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\Exceptions;
+
+use BackedEnum;
+use League\Uri\Idna\Error;
+use League\Uri\Idna\Result;
+use Stringable;
+
+final class ConversionFailed extends SyntaxError
+{
+    private function __construct(
+        string $message,
+        private readonly string $host,
+        private readonly Result $result
+    ) {
+        parent::__construct($message);
+    }
+
+    public static function dueToIdnError(BackedEnum|Stringable|string $host, Result $result): self
+    {
+        $reasons = array_map(fn (Error $error): string => $error->description(), $result->errors());
+
+        if ($host instanceof BackedEnum) {
+            $host = (string) $host->value;
+        }
+
+        return new self('Host `'.$host.'` is invalid: '.implode('; ', $reasons).'.', (string) $host, $result);
+    }
+
+    public function getHost(): string
+    {
+        return $this->host;
+    }
+
+    public function getResult(): Result
+    {
+        return $this->result;
+    }
+}

vendor/league/uri-interfaces/Exceptions/MissingFeature.php

@@ -0,0 +1,21 @@
+<?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\Exceptions;
+
+use League\Uri\Contracts\UriException;
+use RuntimeException;
+
+class MissingFeature extends RuntimeException implements UriException
+{
+}

vendor/league/uri-interfaces/Exceptions/OffsetOutOfBounds.php

@@ -0,0 +1,18 @@
+<?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\Exceptions;
+
+class OffsetOutOfBounds extends SyntaxError
+{
+}

vendor/league/uri-interfaces/Exceptions/SyntaxError.php

@@ -0,0 +1,21 @@
+<?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\Exceptions;
+
+use InvalidArgumentException;
+use League\Uri\Contracts\UriException;
+
+class SyntaxError extends InvalidArgumentException implements UriException
+{
+}