chore: CSP script nonces, deploy health check, dead-code cleanup

Add per-request CSP nonces (drop script unsafe-inline), post-deploy /api/health gate, bump next-auth to beta.32, and remove unused motion/cache/permission helpers.

Co-authored-by: Cursor <[email protected]>

src/lib/admin-helpers.ts

@@ -32,29 +32,6 @@ export function calcPagination(total: number, page: number, perPage: number) {
 	};
 }
 
-/** Generate CSV content from rows */
-export function generateCsv(
-	rows: Record<string, unknown>[],
-	columns: { key: string; label: string }[],
-): string {
-	const BOM = "\uFEFF";
-	const header = columns.map((c) => escapeCsv(c.label)).join(",");
-	const body = rows
-		.map((row) =>
-			columns.map((c) => escapeCsv(String(row[c.key] ?? ""))).join(","),
-		)
-		.join("\n");
-
-	return `${BOM + header}\n${body}`;
-}
-
-function escapeCsv(value: string): string {
-	if (value.includes(",") || value.includes('"') || value.includes("\n")) {
-		return `"${value.replace(/"/g, '""')}"`;
-	}
-	return value;
-}
-
 export function formatTimestamp(ts: number): string {
 	if (!ts) return "N/A";
 	return new Date(ts * 1000).toLocaleString();