i18n(meds): localise the modal-wizard surface

Populates messages/{de,en}.json with every key the new dialog reads
under medications.wizard.*, plus categoryDiabetes and
categoryAntibiotic on the cards' badge namespace; the other four
locales ship the English fallback per project convention. The
retired medications.create.wizard.* namespace is removed from all
six files so the locale-integrity guard surfaces every dangling key
the moment the old surface stops being reachable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/__tests__/i18n-locale-integrity.test.ts

@@ -252,12 +252,12 @@ describe("i18n locale file integrity", () => {
     "targets.status.normal",
     "targets.status.optimal",
     "targets.status.fitness",
-    // v1.5 medication scheduling — SI-unit abbreviations the wizard
+    // v1.5.4 modal wizard — SI-unit abbreviations the wizard
     // surfaces in its dose-unit dropdown. The labels are identical
-    // across every locale (mg / g / ml are universal SI tokens).
-    "medications.create.wizard.step1.dose.unit.mg",
-    "medications.create.wizard.step1.dose.unit.g",
-    "medications.create.wizard.step1.dose.unit.ml",
+    // across every locale (mg / ml / g are universal SI tokens).
+    "medications.wizard.steps.step3.unit.mg",
+    "medications.wizard.steps.step3.unit.ml",
+    "medications.wizard.steps.step3.unit.g",
   ]);
 
   it.each(ALL_LOCALES)("$locale locale has no empty values", ({ path }) => {