export type ComposerPromptSegment =  | {      type: "text";      text: string;    }  | {      type: "mention";      path: string;    }; const MENTION_TOKEN_REGEX = /(^|\s)@([^\s@]+)(?=\s)/g; function pushTextSegment(segments: ComposerPromptSegment[], text: string): void {  if (!text) return;  const last = segments[segments.length - 1];  if (last && last.type === "text") {    last.text += text;    return;  }  segments.push({ type: "text", text });} export function splitPromptIntoComposerSegments(prompt: string): ComposerPromptSegment[] {  const segments: ComposerPromptSegment[] = [];  if (!prompt) {    return segments;  }   let cursor = 0;  for (const match of prompt.matchAll(MENTION_TOKEN_REGEX)) {    const fullMatch = match[0];    const prefix = match[1] ?? "";    const path = match[2] ?? "";    const matchIndex = match.index ?? 0;    const mentionStart = matchIndex + prefix.length;    const mentionEnd = mentionStart + fullMatch.length - prefix.length;     if (mentionStart > cursor) {      pushTextSegment(segments, prompt.slice(cursor, mentionStart));    }     if (path.length > 0) {      segments.push({ type: "mention", path });    } else {      pushTextSegment(segments, prompt.slice(mentionStart, mentionEnd));    }     cursor = mentionEnd;  }   if (cursor < prompt.length) {    pushTextSegment(segments, prompt.slice(cursor));  }   return segments;}