chore: remove dead files flagged by knip

Delete two unreachable files with no importers:
- src/components/ui/dropdown-menu.tsx
- src/lib/admin/verify-interactions.ts

src/lib/admin/verify-interactions.ts

@@ -1,40 +0,0 @@
-export const VERIFY_INTERACTIONS_URL = "/api/admin/import/furni/verify";
-
-export interface VerifyInteractionsResult {
-	fixed: number;
-	checked: number;
-	skipped: number;
-	errors: string[];
-}
-
-type AdminFetcher = (
-	input: RequestInfo | URL,
-	init?: RequestInit,
-) => Promise<Response>;
-
-export async function requestVerifyInteractions(
-	fetcher: AdminFetcher,
-): Promise<VerifyInteractionsResult> {
-	const response = await fetcher(VERIFY_INTERACTIONS_URL, { method: "POST" });
-	const payload = (await response.json()) as Record<string, unknown>;
-	if (!response.ok) {
-		throw new Error(
-			typeof payload.error === "string"
-				? payload.error
-				: "Interaction verification failed",
-		);
-	}
-
-	const errors = Array.isArray(payload.errors)
-		? payload.errors.filter(
-				(value): value is string => typeof value === "string",
-			)
-		: [];
-
-	return {
-		fixed: Number(payload.fixed) || 0,
-		checked: Number(payload.checked) || 0,
-		skipped: Number(payload.skipped) || 0,
-		errors,
-	};
-}