refactor(onboarding): point consumers at the kebab-case component files

Update the onboarding step page, baseline form, and the anamnesis-card
spec to import from the renamed kebab-case files. Export identifiers stay
unchanged.

src/components/onboarding/__tests__/anamnesis-card.test.tsx

@@ -14,7 +14,7 @@ import { I18nProvider } from "@/lib/i18n/context";
 import {
   AnamnesisCard,
   buildAnamnesisAboutMeBody,
-} from "../AnamnesisCard";
+} from "../anamnesis-card";
 
 describe("buildAnamnesisAboutMeBody", () => {
   const empty = { conditions: "", allergies: "" };

src/components/onboarding/baseline-form.tsx

@@ -25,7 +25,7 @@ import {
   AnamnesisCard,
   buildAnamnesisAboutMeBody,
   type AnamnesisValue,
-} from "@/components/onboarding/AnamnesisCard";
+} from "@/components/onboarding/anamnesis-card";
 
 /**
  * v1.4.25 W14b-Content — onboarding step 3 (baseline).