Feat: Extract threads formatting helpers

src/threads-utils.js

@@ -0,0 +1,18 @@
+import { partsToText } from './utils.js';
+
+export const titleFrom = t => {
+  if (!t) return 'Untitled';
+  const s = typeof t === 'string' ? t : (Array.isArray(t) ? partsToText({ content: t }) : 'Untitled');
+  return s.replace(/\s+/g, ' ').trim().slice(0, 60) || 'Untitled';
+};
+
+export const serializeThreadName = t => {
+  const s = (t.title || 'Untitled').replace(/[^a-zA-Z0-9]/g, '_').slice(0, 150);
+  return `${t.pinned ? '1' : '0'}-${t.updatedAt || Date.now()}-${t.id}-${s}.json`;
+};
+
+export const deserializeThreadName = n => {
+  const p = n.replace('.json', '').split('-');
+  if (p.length < 4) return null;
+  return { pinned: p[0] === '1', updatedAt: parseInt(p[1]), id: p[2], title: p.slice(3).join('-').replace(/_/g, ' '), status: 'synced', type: 'thread' };
+};