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"
       }
     }

src/__tests__/i18n-english-leak-guard.test.ts

@@ -82,6 +82,7 @@ const LEGIT_IDENTICAL = new Set<string>([
   "charts.vo2Max",
   "cycle.insights.crosstab.unitGlucose",
   "dashboard.metric.unit.bmi",
+  "dashboard.metric.unit.mood",
   "dashboard.metric.unit.glucose",
   "dashboard.vo2Max",
   "dashboard.vo2MaxShort",

src/lib/dashboard-layout.ts

@@ -605,8 +605,6 @@ export const LAYOUT_FIELD_MERGE_DISPOSITION = {
   heroRingOrder: "preserve",
 } as const satisfies Record<keyof DashboardLayout, "replace" | "preserve">;
 
-export type LayoutFieldMergeDisposition = typeof LAYOUT_FIELD_MERGE_DISPOSITION;
-
 /**
  * The top-level layout fields the widgets PUT carries forward from the stored
  * layout when the request omits them. Derived from

src/lib/dashboard/__tests__/snapshot.test.ts

@@ -752,11 +752,11 @@ describe("buildDashboardSnapshot — layoutCatalogue (35-id round-trip)", () =>
     isFullyCovered.mockReturnValue(false);
   });
 
-  it("emits all 38 catalogue ids with visibility + order", async () => {
+  it("emits all 42 catalogue ids with visibility + order", async () => {
     const snap = await buildDashboardSnapshot(fakePrisma, baseUser());
-    expect(snap.layoutCatalogue).toHaveLength(38);
+    expect(snap.layoutCatalogue).toHaveLength(42);
     const ids = new Set(snap.layoutCatalogue.map((w) => w.id));
-    expect(ids.size).toBe(38);
+    expect(ids.size).toBe(42);
     // iOS-only ids appended default-invisible.
     const walkingSpeed = snap.layoutCatalogue.find(
       (w) => w.id === "walkingSpeed",