Inbox attribution recovery
- Restores the orange Meta/CTWA attribution card above attributed inbox conversations after the selected-thread virtualization pass accidentally dropped the pre-message card render.
- Keeps the card in the shared desktop/mobile message render model so operators can see the campaign, ad, adset, creative, source URL, and ad body context before replying to leads who ask about “this”.
- Adjusts virtualized bottom-scroll targeting to count render items, not only messages, so prepended attribution rows do not disturb bottom positioning.