feat(release): publish minimal self-contained Magent source

frontend/app/lib/login-errors.ts

@@ -0,0 +1,17 @@
+export async function loginErrorMessage(response: Response): Promise<string> {
+  if (response.status === 429) return "Too many attempts. Please wait a moment and try again.";
+  if (response.status >= 500) return "Sign-in is temporarily unavailable. Please try again shortly.";
+  if (response.status === 403) {
+    const payload: unknown = await response.json().catch(() => null);
+    if (
+      payload !== null &&
+      typeof payload === "object" &&
+      "detail" in payload &&
+      payload.detail === "Cross-origin state change rejected"
+    ) {
+      return "Sign-in was blocked by the site's security configuration. Please contact an administrator.";
+    }
+    return "This account cannot sign in. Please contact an administrator.";
+  }
+  return "Check your username and password, then try again.";
+}