New desktop

src/App/App.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+use Desktop\AppRegistry;
+use Desktop\DesktopState;
+use Desktop\SkinResolver;
+use Desktop\WindowManager;
+
+final class App
+{
+    public function __construct(
+        private readonly string $projectRoot,
+    ) {
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function desktopPayload(): array
+    {
+        $registry = new AppRegistry($this->projectRoot . '/config/apps.php');
+        $skins = SkinResolver::all();
+        $activeSkin = SkinResolver::resolve($_GET['skin'] ?? null);
+        $windows = (new WindowManager($registry))->defaultWindows();
+
+        return [
+            'meta' => [
+                'title' => 'Kusche.Berlin Desktop UI',
+                'active_skin' => $activeSkin,
+                'available_skins' => $skins,
+            ],
+            'desktop' => [
+                'greeting' => 'Neue Desktop-Shell fuer Kusche.Berlin',
+                'wallpaper' => SkinResolver::wallpaper($activeSkin),
+                'workspace' => DesktopState::defaultWorkspace(),
+                'login' => [
+                    'authenticated' => false,
+                    'mode' => 'public-home',
+                    'keycloak_theme_handoff' => '/docs/keycloak-theme-handoff.md',
+                ],
+            ],
+            'apps' => $registry->all(),
+            'windows' => $windows,
+            'widgets' => DesktopState::defaultWidgets(),
+            'tray' => DesktopState::trayItems(),
+        ];
+    }
+}

src/App/bootstrap.php

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+<?php
+
+declare(strict_types=1);
+
+spl_autoload_register(static function (string $class): void {
+    $prefixes = [
+        'App\\' => __DIR__ . '/',
+        'Desktop\\' => dirname(__DIR__) . '/Desktop/',
+    ];
+
+    foreach ($prefixes as $prefix => $baseDir) {
+        if (!str_starts_with($class, $prefix)) {
+            continue;
+        }
+
+        $relative = substr($class, strlen($prefix));
+        $path = $baseDir . str_replace('\\', '/', $relative) . '.php';
+
+        if (is_file($path)) {
+            require_once $path;
+        }
+    }
+});

src/Desktop/AppRegistry.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Desktop;
+
+final class AppRegistry
+{
+    /** @var array<int, array<string, mixed>> */
+    private array $apps;
+
+    public function __construct(string $configPath)
+    {
+        /** @var array<int, array<string, mixed>> $apps */
+        $apps = require $configPath;
+        $this->apps = $apps;
+    }
+
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    public function all(): array
+    {
+        return $this->apps;
+    }
+
+    /**
+     * @return array<string, mixed>|null
+     */
+    public function find(string $appId): ?array
+    {
+        foreach ($this->apps as $app) {
+            if (($app['app_id'] ?? null) === $appId) {
+                return $app;
+            }
+        }
+
+        return null;
+    }
+}

src/Desktop/DesktopState.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Desktop;
+
+final class DesktopState
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public static function defaultWorkspace(): array
+    {
+        return [
+            'workspace_id' => 'default',
+            'title' => 'Persoenlicher Desktop',
+            'supports_public_home' => true,
+            'supports_multi_workspace' => true,
+        ];
+    }
+
+    /**
+     * @return array<int, array<string, string>>
+     */
+    public static function defaultWidgets(): array
+    {
+        return [
+            [
+                'widget_id' => 'public-home',
+                'title' => 'Public Home',
+                'content' => 'Oeffentliches Dashboard als Startzustand fuer nicht eingeloggte Nutzer.',
+            ],
+            [
+                'widget_id' => 'personal-links',
+                'title' => 'Persoenliche Links',
+                'content' => 'Platzhalter fuer spaetere user-spezifische Linklisten und Dashboards.',
+            ],
+        ];
+    }
+
+    /**
+     * @return array<int, array<string, string>>
+     */
+    public static function trayItems(): array
+    {
+        return [
+            ['id' => 'network', 'label' => 'Netzwerk'],
+            ['id' => 'widgets', 'label' => 'Widgets'],
+            ['id' => 'account', 'label' => 'Gast'],
+        ];
+    }
+}

src/Desktop/SkinResolver.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Desktop;
+
+final class SkinResolver
+{
+    /**
+     * @return array<int, string>
+     */
+    public static function all(): array
+    {
+        return ['windows', 'apple', 'linux'];
+    }
+
+    public static function resolve(?string $requestedSkin): string
+    {
+        $skin = strtolower((string) $requestedSkin);
+
+        return in_array($skin, self::all(), true) ? $skin : 'windows';
+    }
+
+    public static function wallpaper(string $skin): string
+    {
+        return match ($skin) {
+            'apple' => 'radial-gradient(circle at top, #ffe7ba 0%, #ff9a62 38%, #531b53 100%)',
+            'linux' => 'linear-gradient(140deg, #111827 0%, #1f2937 40%, #ea580c 100%)',
+            default => 'linear-gradient(160deg, #1d4ed8 0%, #0f172a 100%)',
+        };
+    }
+}

src/Desktop/WindowManager.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Desktop;
+
+final class WindowManager
+{
+    public function __construct(
+        private readonly AppRegistry $registry,
+    ) {
+    }
+
+    /**
+     * @return array<int, array<string, mixed>>
+     */
+    public function defaultWindows(): array
+    {
+        $defaults = ['welcome-center', 'public-dashboard'];
+        $windows = [];
+
+        foreach ($defaults as $index => $appId) {
+            $app = $this->registry->find($appId);
+
+            if ($app === null) {
+                continue;
+            }
+
+            $windows[] = [
+                'window_id' => 'window-' . $appId,
+                'app_id' => $appId,
+                'title' => $app['title'],
+                'state' => $index === 0 ? 'focused' : 'open',
+                'x' => 72 + ($index * 48),
+                'y' => 84 + ($index * 36),
+                'width' => $app['default_width'] ?? 640,
+                'height' => $app['default_height'] ?? 420,
+                'content' => $app['summary'] ?? '',
+            ];
+        }
+
+        return $windows;
+    }
+}