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/clock/README.md

@@ -0,0 +1,57 @@
+Clock Component
+===============
+
+Symfony Clock decouples applications from the system clock.
+
+Getting Started
+---------------
+
+```bash
+composer require symfony/clock
+```
+
+```php
+use Symfony\Component\Clock\NativeClock;
+use Symfony\Component\Clock\ClockInterface;
+
+class MyClockSensitiveClass
+{
+    public function __construct(
+        private ClockInterface $clock,
+    ) {
+        // Only if you need to force a timezone:
+        //$this->clock = $clock->withTimeZone('UTC');
+    }
+
+    public function doSomething()
+    {
+        $now = $this->clock->now();
+        // [...] do something with $now, which is a \DateTimeImmutable object
+
+        $this->clock->sleep(2.5); // Pause execution for 2.5 seconds
+    }
+}
+
+$clock = new NativeClock();
+$service = new MyClockSensitiveClass($clock);
+$service->doSomething();
+```
+
+Sponsor
+-------
+
+This package is looking for a [backer][1].
+
+Help Symfony by [sponsoring][3] its development!
+
+Resources
+---------
+
+ * [Documentation](https://symfony.com/doc/current/components/clock.html)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/backers
+[3]: https://symfony.com/sponsor