fix: harden share link dose operations and token reuse (#298)

* fix: harden share link dose operations and token reuse

* fix: restore share dose compatibility and add correlation helper

frontend/src/utils/correlation.ts

@@ -0,0 +1,18 @@
+function createCorrelationId(prefix = "fe"): string {
+	const randomPart = Math.random().toString(36).slice(2, 10);
+	return `${prefix}-${Date.now()}-${randomPart}`;
+}
+
+export function withCorrelation(init: RequestInit, prefix = "fe"): { correlationId: string; init: RequestInit } {
+	const correlationId = createCorrelationId(prefix);
+	const headers = new Headers(init.headers ?? undefined);
+	headers.set("x-correlation-id", correlationId);
+
+	return {
+		correlationId,
+		init: {
+			...init,
+			headers,
+		},
+	};
+}