feat: enhance color handling in templates and dashboard with hex support

templates.py

@@ -49,6 +49,11 @@ def _normalize_templates(raw: dict) -> dict[str, dict]:
         color = incoming.get("color")
         if isinstance(color, int):
             out[key]["color"] = color
+        elif isinstance(color, str):
+            try:
+                out[key]["color"] = parse_color(color)
+            except ValueError:
+                pass
 
         image_url = incoming.get("image_url")
         if isinstance(image_url, str) and image_url.strip():
@@ -74,10 +79,16 @@ def load_templates(path: str | Path) -> dict[str, dict]:
 def save_templates(path: str | Path, templates: dict) -> None:
     p = Path(path)
     normalized = _normalize_templates(templates)
+    serialized = deepcopy(normalized)
+
+    for tpl in serialized.values():
+        color = tpl.get("color")
+        if isinstance(color, int):
+            tpl["color"] = f"#{color:06X}"
 
     p.parent.mkdir(parents=True, exist_ok=True)
     tmp = p.with_suffix(p.suffix + ".tmp")
-    tmp.write_text(json.dumps(normalized, indent=2,
+    tmp.write_text(json.dumps(serialized, indent=2,
                    sort_keys=True) + "\n", encoding="utf-8")
     tmp.replace(p)