feat: add favicon generator and Pyodide profile sync integration

tools/create_favicon.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Create a favicon.ico from an existing PNG asset.
+
+Usage: python tools/create_favicon.py
+
+Produces: ./favicon.ico
+
+The script will try to import Pillow. If it's not available, it prints instructions.
+"""
+import os
+import sys
+
+ROOT = os.path.dirname(os.path.dirname(__file__))
+SRC = os.path.join(ROOT, 'assets', 'BMP_WEWIN.png')
+# fallback to assets/Rat/BMP_WEWIN.png if present
+if not os.path.exists(SRC):
+    alt = os.path.join(ROOT, 'assets', 'Rat', 'BMP_WEWIN.png')
+    if os.path.exists(alt):
+        SRC = alt
+OUT = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'favicon.ico')
+
+
+def ensure_pillow():
+    try:
+        from PIL import Image
+        return Image
+    except Exception:
+        print('Pillow (PIL) is required to run this script. Install with:')
+        print('  pip install Pillow')
+        return None
+
+
+def create_favicon():
+    Image = ensure_pillow()
+    if Image is None:
+        return 2
+
+    if not os.path.exists(SRC):
+        print(f'Source PNG not found: {SRC}')
+        return 1
+
+    try:
+        img = Image.open(SRC)
+        # Create multiple sizes for favicon
+        sizes = [(16, 16), (32, 32), (48, 48), (64, 64)]
+        icons = [img.resize(s, Image.Resampling.LANCZOS) if hasattr(Image, 'Resampling') else img.resize(s) for s in sizes]
+        # Save as ICO
+        icons[0].save(OUT, format='ICO', sizes=sizes)
+        print(f'Created favicon: {OUT}')
+        return 0
+    except Exception as e:
+        print('Failed to create favicon:', e)
+        return 3
+
+
+if __name__ == '__main__':
+    sys.exit(create_favicon())