Consolidate MangaCircus app, scraper, and Compose baseline

public/common.js

@@ -49,9 +49,25 @@ function ago(t) {
   return new Date(t).toLocaleDateString();
 }
 
+function readingDuration(ms, compact = false) {
+  const seconds = Math.max(0, Math.round((+ms || 0) / 1000));
+  if (!seconds) return 'Not timed';
+  if (seconds < 60) return compact ? '<1 min' : 'Under a minute';
+  const minutes = Math.max(1, Math.round(seconds / 60));
+  if (minutes < 60) return `${minutes} min`;
+  const hours = Math.floor(minutes / 60), rest = minutes % 60;
+  return rest ? `${hours} h ${rest} min` : `${hours} h`;
+}
+
 const qsa = obj => { const p = new URLSearchParams(); for (const k in obj) if (obj[k] != null && obj[k] !== '') p.set(k, obj[k]); return p.toString(); };
 const readUrl = (m, c, v) => 'read.html?' + qsa({ m, c, v });
 const mangaUrl = m => 'manga.html?' + qsa({ m });
+const libraryUrlForTags = tags => {
+  const p = new URLSearchParams();
+  for (const tag of tags || []) if (tag) p.append('tag', tag);
+  const query = p.toString();
+  return './' + (query ? '?' + query : '');
+};
 const safeHref = u => (/^https?:\/\//i.test(u || '') ? u : null);
 
 // Top navigation with the notification bell.