Feature/messages scroll persistence - #178
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Add SavedScroll state and messages_reset_for_session to MessagesView so that switching sessions saves/restores the logical scroll anchor and follow-tail flag, and a same-session resync freezes the visible offset instead of jumping to the bottom.
Route notify_messages_reset and remove_empty_containers through MessagesView::messages_reset_for_session with the current session id, so that: - switching sessions restores each session's remembered scroll position and follow-tail state, - a same-session resync (stream lag, file-watcher refresh, structural edit) freezes the visible offset instead of snapping to the bottom. Session deletion forgets the remembered scroll for that session.
The instant jump-to-bottom used ListState::scroll_to_reveal_item, which computes a pixel target from item heights. Right after reset() the list items are unmeasured (zero height), so it landed at the TOP — visible when returning to a long session that was scrolled to the end. Use ListState::scroll_to_end instead: it anchors past the last item so the layout pass walks backwards from the end and reveals the true bottom regardless of measurement state. Also keep a following session pinned to the end across the height-cache remeasures. Adds a regression test asserting a follow-tail restore anchors past the last item.
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