chore: add TokenLens sources and ignore rules

tests/displayFormat.test.mjs

@@ -0,0 +1,12 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { formatTokensZh } from "../src/renderer/displayFormat.js";
+
+test("formatTokensZh uses Chinese magnitude units instead of western suffixes", () => {
+  assert.equal(formatTokensZh(9999), "9999");
+  assert.equal(formatTokensZh(10_000), "1万");
+  assert.equal(formatTokensZh(71_400), "7.1万");
+  assert.equal(formatTokensZh(6_600_000), "660万");
+  assert.equal(formatTokensZh(196_700_000), "1.97亿");
+  assert.equal(formatTokensZh(1_020_000_000), "10.2亿");
+});