fix(flowchat): stabilize virtual item estimates - #2271
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Use data-driven height estimators for unmounted FlowChat items so TanStack Virtual reserves space according to message content, tool state, reading width, and Explore expansion state. Preserve measured DOM sizes while invalidating derived positions when estimate inputs change. Also stop the viewport anchor RAF loop when the anchor remains in-place, and extend the gated viewport diagnostics with bounded estimate breakdowns for resize investigations.
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Use data-driven height estimators for unmounted FlowChat items so
TanStack Virtual reserves space according to message content, tool
state, reading width, and Explore expansion state. Preserve measured
DOM sizes while invalidating derived positions when estimate inputs
change.
Also stop the viewport anchor RAF loop when the anchor remains
in-place, and extend the gated viewport diagnostics with bounded
estimate breakdowns for resize investigations.