feat: Phase 4 - CI/CD, Static Analysis, Browser Tests

- Add GitHub Actions CI workflow (.github/workflows/ci.yml)
  - Laravel Pint code style check
  - PHPStan static analysis (level 5)
  - Test suite with parallel execution
  - Dusk browser tests (disabled by default)
- Add phpstan.neon config (level 5, ignores User notifications methods)
- Add Dusk browser tests (ProjectWorkflowTest)
- Install laravel/dusk + chromedriver

Tests: 101 passing (319 assertions)

tests/DuskTestCase.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Tests;
+
+use Facebook\WebDriver\Chrome\ChromeOptions;
+use Facebook\WebDriver\Remote\DesiredCapabilities;
+use Facebook\WebDriver\Remote\RemoteWebDriver;
+use Illuminate\Support\Collection;
+use Laravel\Dusk\TestCase as BaseTestCase;
+use PHPUnit\Framework\Attributes\BeforeClass;
+
+abstract class DuskTestCase extends BaseTestCase
+{
+    /**
+     * Prepare for Dusk test execution.
+     */
+    #[BeforeClass]
+    public static function prepare(): void
+    {
+        if (! static::runningInSail()) {
+            static::startChromeDriver(['--port=9515']);
+        }
+    }
+
+    /**
+     * Create the RemoteWebDriver instance.
+     */
+    protected function driver(): RemoteWebDriver
+    {
+        $options = (new ChromeOptions)->addArguments(collect([
+            $this->shouldStartMaximized() ? '--start-maximized' : '--window-size=1920,1080',
+            '--disable-search-engine-choice-screen',
+            '--disable-smooth-scrolling',
+        ])->unless($this->hasHeadlessDisabled(), function (Collection $items) {
+            return $items->merge([
+                '--disable-gpu',
+                '--headless=new',
+            ]);
+        })->all());
+
+        return RemoteWebDriver::create(
+            $_ENV['DUSK_DRIVER_URL'] ?? env('DUSK_DRIVER_URL') ?? 'http://localhost:9515',
+            DesiredCapabilities::chrome()->setCapability(
+                ChromeOptions::CAPABILITY, $options
+            )
+        );
+    }
+}