feat: add OpenDocument PDF templates

src/ccma/ui/file_open.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+
+def open_path(path: Path) -> None:
+    selected = path.resolve()
+    if sys.platform == "win32":
+        os.startfile(selected)  # type: ignore[attr-defined]
+    elif sys.platform == "darwin":
+        subprocess.Popen(["open", str(selected)])
+    else:
+        subprocess.Popen(["xdg-open", str(selected)])