ARIA
4866f14231
- User send: always scroll so the bottom of the own message is visible above the composer (scroll = new content: message + spacers), even while reading history. - Agent message: while at the bottom, land on the natural reading position — top-aligned with the viewport top when the bubble is taller than the viewport, bottom-aligned otherwise. - Streaming follow: keep the live bubble's bottom visible while it fits the viewport; once it outgrows the viewport, top-align it once and hand over to the user (no yank-back on later deltas).