Validate hotkeys and support Super alias

src/config.py

@@ -6,6 +6,7 @@ from pathlib import Path
 from typing import Any
 
 from constants import DEFAULT_CONFIG_PATH
+from hotkey import split_hotkey
 
 
 DEFAULT_HOTKEY = "Cmd+m"
@@ -73,7 +74,11 @@ def load(path: str | None) -> Config:
         if not isinstance(data, dict):
             raise ValueError("config must be a JSON object")
         cfg = _from_dict(data, cfg)
+        validate(cfg)
+        return cfg
+
     validate(cfg)
+    _write_default_config(p, cfg)
     return cfg
 
 
@@ -81,10 +86,19 @@ def redacted_dict(cfg: Config) -> dict[str, Any]:
     return asdict(cfg)
 
 
+def _write_default_config(path: Path, cfg: Config) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(f"{json.dumps(redacted_dict(cfg), indent=2)}\n", encoding="utf-8")
+
+
 def validate(cfg: Config) -> None:
     hotkey = cfg.daemon.hotkey.strip()
     if not hotkey:
         raise ValueError("daemon.hotkey cannot be empty")
+    try:
+        split_hotkey(hotkey)
+    except ValueError as exc:
+        raise ValueError(f"daemon.hotkey is invalid: {exc}") from exc
 
     if isinstance(cfg.recording.input, bool):
         raise ValueError("recording.input cannot be boolean")