Implementieren der PWA, Multi-Instanzen-Passwort-Schutz und Kassen-Löschfunktion

gen_icons.py

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+from PIL import Image, ImageDraw, ImageFont
+import os
+
+def create_icon(size, filename):
+    # Create a red square
+    img = Image.new('RGB', (size, size), color='#dc3545')
+    draw = ImageDraw.Draw(img)
+    
+    # Try to draw a simple 'E' in the center as a fallback if no emoji font
+    # Calculate approximate font size
+    font_size = int(size * 0.6)
+    try:
+        # standard windows font
+        font = ImageFont.truetype("arialbd.ttf", font_size)
+    except IOError:
+        font = ImageFont.load_default()
+    
+    text = "E"
+    # Get bounding box 
+    left, top, right, bottom = draw.textbbox((0, 0), text, font=font)
+    text_w = right - left
+    text_h = bottom - top
+    
+    x = (size - text_w) / 2
+    y = (size - text_h) / 2
+    
+    draw.text((x, y), text, fill=(255, 255, 255), font=font)
+    
+    # Save the image
+    filepath = os.path.join('static', filename)
+    img.save(filepath)
+    print(f"Saved {filepath}")
+
+if __name__ == "__main__":
+    create_icon(192, 'icon-192x192.png')
+    create_icon(512, 'icon-512x512.png')