feat(vi): add project VI assets - logo iconset, PSD, vector, banner (#425)

- darklogo/lightlogo iconset (16-512px) and .ico
- PSD source files (darklogo, lightlogo, bannersource)
- Vector file (dsa_logo.ai)
- banner.png for repo Social preview
# skip

sources/dsa_vi/gen_icons.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""
+Generate .ico files from source PNG. Uses largest available from iconset or source.
+Sizes: 16, 32, 64, 128, 256, 512.
+"""
+from pathlib import Path
+
+try:
+    from PIL import Image
+except ImportError:
+    raise SystemExit("Pillow required: pip install Pillow")
+
+ICON_DIR = Path(__file__).parent
+SIZES = [(16, 16), (32, 32), (64, 64), (128, 128), (256, 256), (512, 512)]
+
+
+def make_ico(name: str, source: Path) -> None:
+    """Create multi-resolution .ico from source image."""
+    img = Image.open(source).convert("RGBA")
+    out = ICON_DIR / f"{name}.ico"
+    img.save(out, format="ICO", sizes=SIZES)
+    print(f"Created {out}")
+
+
+def main() -> None:
+    for name in ("darklogo", "lightlogo"):
+        src = ICON_DIR / f"{name}.png"
+        if src.exists():
+            make_ico(name, src)
+        else:
+            print(f"Skip {name}: {src} not found")
+
+
+if __name__ == "__main__":
+    main()