chore: reconcile the catalogue and metric-unit guards

The widget catalogue grew to 42 ids, so the snapshot round-trip count
follows. The mood card's unit key carries "/5" rather than an empty
string — the locale-integrity guard forbids empty values, and the scale
is the honest thing to print next to a 1-to-5 score. It joins the
identical-across-locales allowlist alongside the other unit notations.

messages/de.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }

messages/en.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }

messages/es.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }

messages/fr.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }

messages/it.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }

messages/pl.json

@@ -440,7 +440,7 @@
         "totalBodyWater": "kg",
         "boneMass": "kg",
         "oxygenSaturation": "%",
-        "mood": "",
+        "mood": "/5",
         "bmi": "kg/m²"
       }
     }