feat: add reusable private and shared account icons

apps/api/scripts/convert-icons.py

@@ -0,0 +1,14 @@
+"""Optional catalog maintenance: convert downloaded ICO files using Pillow.
+
+Normal installs use the committed PNG assets and do not need Python.
+Run after download-icons.cjs, before icons:seed.
+"""
+from pathlib import Path
+from PIL import Image
+
+folder = Path(__file__).resolve().parent.parent / 'assets' / 'icons'
+for source in folder.glob('*.ico'):
+    with Image.open(source) as image:
+        image.convert('RGBA').save(source.with_suffix('.png'))
+    source.unlink()
+print('Catalog ICO sources converted to PNG.')