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/polyfill-intl-idn/composer.json

@@ -0,0 +1,40 @@
+{
+    "name": "symfony/polyfill-intl-idn",
+    "type": "library",
+    "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
+    "keywords": ["polyfill", "shim", "compatibility", "portable", "intl", "idn"],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Laurent Bassin",
+            "email": "laurent@bassin.info"
+        },
+        {
+            "name": "Trevor Rowbotham",
+            "email": "trevor.rowbotham@pm.me"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=7.2",
+        "symfony/polyfill-intl-normalizer": "^1.10"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Polyfill\\Intl\\Idn\\": "" },
+        "files": [ "bootstrap.php" ]
+    },
+    "suggest": {
+        "ext-intl": "For best performance"
+    },
+    "minimum-stability": "dev",
+    "extra": {
+        "thanks": {
+            "name": "symfony/polyfill",
+            "url": "https://github.com/symfony/polyfill"
+        }
+    }
+}