Removed pngs from chain json

remove_png_base64.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+
+def remove_icon_png_base64_lines(path: Path) -> int:
+    original = path.read_text(encoding="utf-8")
+    lines = original.splitlines(keepends=True)
+
+    kept_lines = []
+    removed = 0
+
+    for line in lines:
+        if '"icon_png_base64"' in line:
+            removed += 1
+            continue
+        kept_lines.append(line)
+
+    if removed:
+        path.write_text("".join(kept_lines), encoding="utf-8")
+
+    return removed
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        description="Remove icon_png_base64 fields from atc_chains.json while preserving all other text."
+    )
+    parser.add_argument(
+        "path",
+        nargs="?",
+        default="atc_chains.json",
+        help="Path to the JSON file to rewrite in place.",
+    )
+    args = parser.parse_args()
+
+    path = Path(args.path)
+    removed = remove_icon_png_base64_lines(path)
+    print(f"Removed {removed} icon_png_base64 field(s) from {path}.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())