New worlds: the menu card says when each world was published (#368)

ddiff --git a/apps/server/src/net/menuCard.test.ts b/apps/server/src/net/menuCard.test.ts
iindex 9e6e971..2f778f7 100644
---- a/apps/server/src/net/menuCard.test.ts
++++ b/apps/server/src/net/menuCard.test.ts
@@@ -78,8 +78,8 @@ describe('the menu network card (frame.menu-card@1)', () => {
      })
      expect(card.more).toEqual({ label: 'All worlds', url: 'https://openvibe.games/worlds' })
      expect(card.items).toEqual([
--      { title: 'World a', meta: 'by Builder', url: 'https://openvibe.games/worlds/a' },
--      { title: 'Moon base', meta: 'by Builder', url: 'https://openvibe.games/worlds/b' },
++      { title: 'World a', meta: 'by Builder · just now', url: 'https://openvibe.games/worlds/a' },
++      { title: 'Moon base', meta: 'by Builder · just now', url: 'https://openvibe.games/worlds/b' },
      ])
      expect(card.title.length).toBeLessThanOrEqual(60)
      for (const item of card.items) {
@@@ -93,6 +93,13 @@ describe('the menu network card (frame.menu-card@1)', () => {
      expect(contracts.validate('frame.menu-cards@1', [card]).valid).toBe(true)
    })
  
++  it('says when each world was published, in the same short shape as the other cards', () => {
++    expect(cardFrom([world('a', { publishedAt: NOW - 2 * 86_400_000 })], NOW).items[0]!.meta).toBe('by Builder · 2d ago')
++    expect(cardFrom([world('a', { publishedAt: NOW - 3 * 3_600_000 })], NOW).items[0]!.meta).toBe('by Builder · 3h ago')
++    // An old row with no published stamp still says when it was made rather than nothing.
++    expect(cardFrom([world('a', { publishedAt: null, createdAt: NOW - 5 * 86_400_000 })], NOW).items[0]!.meta).toBe('by Builder · 5d ago')
++  })
++
    it('sends at most six, and never a draft or a hidden world', () => {
      const many = Array.from({ length: 8 }, (_, i) => world(`w${i}`))
      expect(cardFrom(many, NOW).items).toHaveLength(6)
ddiff --git a/apps/server/src/net/menuCard.ts b/apps/server/src/net/menuCard.ts
iindex f990b7e..1d06401 100644
---- a/apps/server/src/net/menuCard.ts
++++ b/apps/server/src/net/menuCard.ts
@@@ -29,16 +29,31 @@ export function plain(value: unknown, max: number): string {
      .slice(0, max)
  }
  
--/** The card itself, newest published world first (the store's order). */
++/** A short age for the card's one meta line ("2d ago"), the same shape the other sites' cards print. */
++function shortAgo(ms: number, now: number): string {
++  const min = Math.max(0, Math.round((now - ms) / 60000))
++  if (min < 1) return 'just now'
++  if (min < 60) return `${min}m ago`
++  const h = Math.round(min / 60)
++  if (h < 24) return `${h}h ago`
++  return `${Math.round(h / 24)}d ago`
++}
++
++/** The card itself, newest published world first (the store's order), each saying when it was published. */
  export function cardFrom(worlds: CreatorWorld[], at = Date.now()): MenuCard {
    const items = (Array.isArray(worlds) ? worlds : [])
      .filter((w) => w && w.id && w.status === 'published')
      .slice(0, 6)
--    .map((w) => ({
--      title: plain(w.title, 80),
--      meta: `by ${plain(w.ownerName, 110)}`,
--      url: `${BASE}/worlds/${encodeURIComponent(w.id)}`,
--    }))
++    .map((w) => {
++      // A published world's own time; an old row with no published stamp falls back to when it was made.
++      const published = w.publishedAt ?? w.createdAt
++      const when = Number.isFinite(published) ? ` · ${shortAgo(published, at)}` : ''
++      return {
++        title: plain(w.title, 80),
++        meta: `by ${plain(w.ownerName, 100)}${when}`,
++        url: `${BASE}/worlds/${encodeURIComponent(w.id)}`,
++      }
++    })
    return menuCard({
      id: CARD_ID,
      site: SITE,