Pad host profile in runtime names

rvctl.py

@@ -3366,9 +3366,15 @@ def runtime_name_slug(raw_value: str, field_name: str) -> str:
     return slug
 
 
+def display_profile_slug(profile: str) -> str:
+    if profile == "host":
+        return "_host"
+    return profile
+
+
 def runtime_name(user_name: str, profile: str, selector: str, window_name: str) -> str:
     selector_parts = selector.split("/")
-    name_parts = [display_user_slug(user_name), profile]
+    name_parts = [display_user_slug(user_name), display_profile_slug(profile)]
     name_parts.extend(runtime_name_slug(part, "card selector") for part in selector_parts)
     name_parts.append(runtime_name_slug(window_name, "tmux window name"))
     return "_".join(name_parts)