Add PWA manifest and apple-touch-icon meta tag

public/icons/README.md

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+# PWA Icons Required
+
+This directory must contain the following icon files for proper PWA installation on iOS and Android devices:
+
+## Required Icon Files
+
+### Android Icons
+- **icon-192x192.png** (192×192 pixels)
+  - Used for Android home screen and app drawer
+  - Should have transparent background or match theme color
+  - Include safe zone padding for maskable icons (40px margin)
+
+- **icon-512x512.png** (512×512 pixels)
+  - Used for Android splash screens and high-resolution displays
+  - Should have transparent background or match theme color
+  - Include safe zone padding for maskable icons (102px margin)
+
+### iOS Icon
+- **apple-touch-icon.png** (180×180 pixels)
+  - Used for iOS home screen
+  - Should NOT have transparent background (iOS adds its own rounded corners)
+  - Fill entire canvas with brand colors/logo
+  - iOS automatically applies rounded corners and shadow
+
+## Design Guidelines
+
+1. **Brand consistency**: Use Stargirlnails logo and brand colors
+2. **Theme color**: Primary pink (#ec4899) matches manifest theme_color
+3. **Contrast**: Ensure icon is visible on various backgrounds
+4. **Simplicity**: Icons should be recognizable at small sizes
+5. **No text**: Avoid small text that becomes unreadable when scaled
+
+## Testing
+
+After adding icons:
+- Test on Android: Check home screen icon appearance
+- Test on iOS Safari: Add to home screen and verify icon quality
+- Validate with Lighthouse PWA audit
+
+## Placeholder
+
+Until actual icons are created, you can use a favicon.png (if available) or generate placeholder icons using tools like:
+- https://realfavicongenerator.net/
+- https://www.pwabuilder.com/imageGenerator
+

public/manifest.json

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+{
+  "name": "Stargirlnails Kiel - Terminbuchung",
+  "short_name": "Stargirlnails",
+  "description": "Online Terminbuchung für Nagelstudio Stargirlnails in Kiel",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#ec4899",
+  "orientation": "portrait",
+  "lang": "de",
+  "icons": [
+    {
+      "src": "/icons/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icons/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icons/apple-touch-icon.png",
+      "sizes": "180x180",
+      "type": "image/png"
+    }
+  ]
+}
+