Drop the type imports left behind by the extract-prompt re-export

CadenceKind and WeekdayToken were imported only to be re-exported. The
re-export went in the previous commit but the import survived, because
the doc comment above it still named both types at the time.

src/lib/ai/coach/medication-extract-prompt.ts

@@ -29,11 +29,7 @@
 
 import { z } from "zod/v4";
 
-import {
-  WEEKDAY_TOKENS,
-  type CadenceKind,
-  type WeekdayToken,
-} from "@/components/medications/scheduling/types";
+import { WEEKDAY_TOKENS } from "@/components/medications/scheduling/types";
 
 /** Closed list — matches the design-synthesis dose-unit dropdown. */
 export const DOSE_UNITS = [