refactor(housekeeping): return result from bulkImport, remove dead server calls, sync i18n

- bulkImportPermissions now returns {count, errors} instead of void
- ImportSection shows per-entry error details in toast
- Remove testRankPermission server action (test is 100% client-side)
- Clean up unused testing state in TestSection
- Sync pages.admin.{import,translations} keys to all 20 languages
- Add importedWithErrors translation key to all locales

src/app/admin/housekeeping/client.tsx

@@ -10,7 +10,6 @@ import {
 	clearAllPermissions,
 	deletePermission,
 	exportPermissions,
-	testRankPermission,
 	upsertPermission,
 } from "@/actions/admin-housekeeping";
 
@@ -429,24 +428,14 @@ export function TestSection({ permissions }: { permissions: HKPerm[] }) {
 		rank: number;
 		permissions: string[];
 	} | null>(null);
-	const [testing, setTesting] = useState(false);
 
-	const handleTest = useCallback(async () => {
+	const handleTest = useCallback(() => {
 		const rank = Number(testRank);
 		if (!Number.isFinite(rank) || rank < 0)
 			return toast.error(t("invalidRank"));
-		setTesting(true);
-		try {
-			const fd = new FormData();
-			fd.set("testRank", testRank);
-			await testRankPermission(fd);
-			const matching = permissions.filter((p) => p.minRank <= rank);
-			setTestResult({ rank, permissions: matching.map((p) => p.permission) });
-			toast.success(t("testDone", { count: matching.length }));
-		} catch {
-			toast.error(t("errorOccurred"));
-		}
-		setTesting(false);
+		const matching = permissions.filter((p) => p.minRank <= rank);
+		setTestResult({ rank, permissions: matching.map((p) => p.permission) });
+		toast.success(t("testDone", { count: matching.length }));
 	}, [testRank, permissions, t]);
 
 	return (
@@ -467,10 +456,9 @@ export function TestSection({ permissions }: { permissions: HKPerm[] }) {
 				<button
 					type="button"
 					onClick={handleTest}
-					disabled={testing}
 					className="btn btn-primary"
 				>
-					{testing ? t("testing") : t("test")}
+					{t("test")}
 				</button>
 			</div>
 			{testResult && (
@@ -513,8 +501,17 @@ export function ImportSection() {
 
 			setImporting(true);
 			try {
-				await bulkImportPermissions(fd);
-				toast.success(t("imported"));
+				const result = await bulkImportPermissions(fd);
+				if (result.errors.length > 0) {
+					toast.error(
+						t("importedWithErrors", {
+							count: result.count,
+							errors: result.errors.length,
+						}),
+					);
+				} else {
+					toast.success(t("imported", { count: result.count }));
+				}
 				if (textareaRef.current) textareaRef.current.value = "";
 				router.refresh();
 			} catch {