feat: add telegram message splitting utility

src/utils/telegram.ts

@@ -0,0 +1,36 @@
+const MAX_LENGTH = 4096;
+
+export function splitMessage(text: string): string[] {
+  if (text.length <= MAX_LENGTH) return [text];
+
+  const chunks: string[] = [];
+  let remaining = text;
+
+  while (remaining.length > 0) {
+    if (remaining.length <= MAX_LENGTH) {
+      chunks.push(remaining);
+      break;
+    }
+
+    // Try to split at paragraph boundary
+    let splitAt = remaining.lastIndexOf("\n\n", MAX_LENGTH);
+    if (splitAt === -1 || splitAt < MAX_LENGTH / 2) {
+      // Try line boundary
+      splitAt = remaining.lastIndexOf("\n", MAX_LENGTH);
+    }
+    if (splitAt === -1 || splitAt < MAX_LENGTH / 2) {
+      // Hard split
+      splitAt = MAX_LENGTH;
+    }
+
+    chunks.push(remaining.slice(0, splitAt));
+    remaining = remaining.slice(splitAt).trimStart();
+  }
+
+  return chunks;
+}
+
+export function escapeMarkdown(text: string): string {
+  // grammy supports Markdown parse mode — minimal escaping needed
+  return text;
+}