made a leaderboard module

src/leaderboard.js

@@ -0,0 +1,50 @@
+// @ts-nocheck
+import { writable, get } from "svelte/store";
+
+const STORAGE_KEY = "neuro_leaderboard";
+
+export const leaderboard = writable([]);
+export const playerName = writable("");
+export const hasSubmitted = writable(false);
+
+// Load leaderboard
+export function loadLeaderboard() {
+  try {
+    const stored = JSON.parse(localStorage.getItem(STORAGE_KEY)) || [];
+    leaderboard.set(stored);
+  } catch {
+    leaderboard.set([]);
+  }
+}
+
+// Save leaderboard to storage
+export function commitLeaderboard() {
+  const board = get(leaderboard);
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(board));
+}
+
+// Save score
+export function saveScore(score) {
+  if (get(hasSubmitted)) return;
+
+  let name = get(playerName).trim() || "Anonymous";
+  const board = [...get(leaderboard)];
+
+  const index = board.findIndex(
+    entry => entry.name.toLowerCase() === name.toLowerCase()
+  );
+
+  if (index !== -1) {
+    if (score > board[index].score) {
+      board[index].score = score;
+    }
+  } else {
+    board.push({ name, score });
+  }
+
+  board.sort((a, b) => b.score - a.score);
+
+  leaderboard.set(board);
+  commitLeaderboard();
+  hasSubmitted.set(true);
+}