Inbox panel — content slot
This is where the WhatsApp inbox UI ports in (158 drafts feed, tile view, approve/reject, mark actioned).
Same Firestore (whatsapp_inbox, whatsapp_events, pd_deals_index) — no data move, just the UI rendering against it.
Future tiles wire up next: Tasks = universal tasks/ feed across every Vistaza app · Threads = source-grouped conversation view · Apps = per-app dashboards (Install, PM Profit, Owner, Architect, QCJ, Shops).