refactor(commands): centralize shared command formatting helpers

src/commands/text-format.ts

@@ -0,0 +1,7 @@
+export const shortenText = (value: string, maxLen: number) => {
+  const chars = Array.from(value);
+  if (chars.length <= maxLen) {
+    return value;
+  }
+  return `${chars.slice(0, Math.max(0, maxLen - 1)).join("")}…`;
+};