fix: mark intl call as pure

deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@textplace/core",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "exports": "./src/mod.ts",
   "imports": {
     "@std/cli": "jsr:@std/cli@1"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@textplace/core",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "The core logic of TextPlace.",
   "license": "MIT",
   "type": "module",

src/logic/character.ts

@@ -1,6 +1,8 @@
 import { unicodeWidth } from "@std/cli/unicode-width";
 
-const segmenter = new Intl.Segmenter("en", { granularity: "grapheme" });
+const segmenter = /*#__PURE__*/ new Intl.Segmenter("en", {
+  granularity: "grapheme",
+});
 
 export function getCharacterWidth(ch: string): number {
   const segments = [...segmenter.segment(ch)];