fix: versioned API URLs + missing Separator component (#1496-#1499)

frontend/src/components/ui/separator.tsx

@@ -0,0 +1,31 @@
+/**
+ * Separator component (#1498).
+ *
+ * `app/document/[id]/page.tsx` imported `@/components/ui/separator`, which did
+ * not exist and broke the build. This provides the missing component.
+ */
+import * as React from "react";
+
+export interface SeparatorProps extends React.HTMLAttributes<HTMLDivElement> {
+  orientation?: "horizontal" | "vertical";
+}
+
+export const Separator = React.forwardRef<HTMLDivElement, SeparatorProps>(
+  ({ orientation = "horizontal", className = "", ...props }, ref) => (
+    <div
+      ref={ref}
+      role="separator"
+      aria-orientation={orientation}
+      className={[
+        orientation === "horizontal" ? "h-px w-full" : "h-full w-px",
+        "bg-gray-200",
+        className,
+      ].join(" ")}
+      {...props}
+    />
+  ),
+);
+
+Separator.displayName = "Separator";
+
+export default Separator;

frontend/src/lib/api-version.ts

@@ -0,0 +1,20 @@
+/**
+ * Versioned API URL helpers (#1499).
+ *
+ * 26 fetch call sites in 9 pages used unversioned `/api/...` URLs, while the
+ * backend serves `/api/v1/...`. These helpers build versioned URLs so call
+ * sites stop drifting and pick up the version in one place.
+ */
+export const API_VERSION = "v1";
+
+const RAW_BASE = process.env.NEXT_PUBLIC_API_URL ?? "";
+
+/** Base URL including the API version, e.g. `https://host/api/v1`. */
+export function apiBaseUrl(): string {
+  return `${RAW_BASE.replace(/\/+$/, "")}/api/${API_VERSION}`;
+}
+
+/** Build a versioned API URL from a path such as `/disputes/1`. */
+export function apiUrl(path: string): string {
+  return `${apiBaseUrl()}/${path.replace(/^\/+/, "")}`;
+}