Harden gameplay timing and map loading

lib/client-api.ts

@@ -0,0 +1,41 @@
+export async function api<T = Record<string, unknown>>(
+  path: string,
+  body?: unknown,
+  method = body === undefined ? "GET" : "POST",
+): Promise<T> {
+  let response: Response;
+  try {
+    response = await fetch("/api/v1/" + path, {
+      signal: AbortSignal.timeout(30000),
+      cache: "no-store",
+      method,
+      headers:
+        body === undefined ? undefined : { "Content-Type": "application/json" },
+      body: body === undefined ? undefined : JSON.stringify(body),
+    });
+  } catch (error) {
+    if (
+      error instanceof Error &&
+      ["TimeoutError", "AbortError"].includes(error.name)
+    )
+      throw new Error("The request timed out. Reconnect and try again.");
+    throw new Error(
+      "Could not reach MineGeo. Check your connection and try again.",
+    );
+  }
+  let data: T & { error?: string };
+  try {
+    data = await response.json();
+  } catch {
+    throw new Error(
+      "MineGeo returned an unreadable response. Please try again.",
+    );
+  }
+  if (!response.ok)
+    throw new Error(
+      typeof data?.error === "string"
+        ? data.error
+        : "Request failed. Please try again.",
+    );
+  return data;
+}