fix(cli): clear lint warnings

src/cli/banner.ts

@@ -10,6 +10,20 @@ type BannerOptions = TaglineOptions & {
 
 let bannerEmitted = false;
 
+const graphemeSegmenter =
+  typeof Intl !== "undefined" && "Segmenter" in Intl
+    ? new Intl.Segmenter(undefined, { granularity: "grapheme" })
+    : null;
+
+function splitGraphemes(value: string): string[] {
+  if (!graphemeSegmenter) return Array.from(value);
+  try {
+    return Array.from(graphemeSegmenter.segment(value), (seg) => seg.segment);
+  } catch {
+    return Array.from(value);
+  }
+}
+
 const hasJsonFlag = (argv: string[]) =>
   argv.some((arg) => arg === "--json" || arg.startsWith("--json="));
 
@@ -62,7 +76,7 @@ export function formatCliBannerArt(options: BannerOptions = {}): string {
         theme.accent("🦞")
       );
     }
-    return [...line].map(colorChar).join("");
+    return splitGraphemes(line).map(colorChar).join("");
   });
 
   return colored.join("\n");