fix: replace blurry upscaled PNG icons with high-quality SVG-generated icons

- Generate crisp PNG icons directly from SVG using cairosvg
- Add support for 256px icon size for better high-DPI display support
- Create generate_icons.py script for easy icon regeneration
- Significantly reduce file sizes while improving visual quality
- Update icon loading to support all sizes (16px to 256px)

Author: marci

assets/bash-script-maker-128.png

@@ -267,7 +267,7 @@ def set_window_icon(self):
             script_dir = os.path.dirname(os.path.abspath(__file__))
 
             # Icon-Größen die wir haben
-            icon_sizes = [16, 32, 48, 64, 128]
+            icon_sizes = [16, 32, 48, 64, 128, 256]
             icon_files = []
 
             # Verfügbare Icon-Dateien sammeln

assets/bash-script-maker-16.png

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Icon-Generator für Bash-Script-Maker
+Erstellt PNG-Icons in verschiedenen Größen aus der SVG-Datei
+"""
+
+import os
+import sys
+
+def generate_icons():
+    """Generiert PNG-Icons aus der SVG-Datei"""
+    try:
+        import cairosvg
+    except ImportError:
+        print("Fehler: cairosvg ist nicht installiert.")
+        print("Installieren Sie es mit: pip install cairosvg")
+        return False
+    
+    # Pfade definieren
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    svg_path = os.path.join(script_dir, "assets", "bash-script-maker.svg")
+    
+    if not os.path.exists(svg_path):
+        print(f"Fehler: SVG-Datei nicht gefunden: {svg_path}")
+        return False
+    
+    # Icon-Größen definieren
+    sizes = [16, 32, 48, 64, 128, 256]
+    
+    print("=== Bash-Script-Maker Icon Generator ===")
+    print(f"Quelle: {svg_path}")
+    print()
+    
+    success_count = 0
+    
+    for size in sizes:
+        output_path = os.path.join(script_dir, "assets", f"bash-script-maker-{size}.png")
+        
+        try:
+            # SVG zu PNG konvertieren
+            cairosvg.svg2png(
+                url=svg_path,
+                write_to=output_path,
+                output_width=size,
+                output_height=size
+            )
+            
+            # Dateigröße überprüfen
+            file_size = os.path.getsize(output_path)
+            print(f"✓ {os.path.basename(output_path)} ({size}x{size}) - {file_size:,} Bytes")
+            success_count += 1
+            
+        except Exception as e:
+            print(f"✗ Fehler bei {size}x{size}: {e}")
+    
+    print()
+    print(f"Erfolgreich: {success_count}/{len(sizes)} Icons erstellt")
+    return success_count == len(sizes)
+
+def main():
+    """Hauptfunktion"""
+    if len(sys.argv) > 1 and sys.argv[1] in ['-h', '--help']:
+        print(__doc__)
+        print("\nVerwendung:")
+        print("  python3 generate_icons.py")
+        print("\nVoraussetzungen:")
+        print("  pip install cairosvg")
+        return
+    
+    success = generate_icons()
+    sys.exit(0 if success else 1)
+
+if __name__ == "__main__":
+    main()