fix(flow-chat): stabilize paged history scrolling - #2267
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Completed thinking rows were reserved at their full content height even when the renderer mounted them collapsed. Late measurement then removed thousands of pixels and could move an upward-scrolling reader toward the tail. Project the thinking expansion state into both rendering and height estimation. Apply late measurement deltas only when the entire row is above the viewport, and let those shifts invalidate stale snap-back targets. Keep coalesced item-resize diagnostics behind the FlowChat diagnostics switch. The probe records row identity, measurement geometry, and whether compensation was applied without logging flow-item content. Partly visible rows are intentionally left uncompensated. No persisted or remote protocol shapes change.
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Completed thinking rows were reserved at their full content height even when
the renderer mounted them collapsed. Late measurement then removed thousands
of pixels and could move an upward-scrolling reader toward the tail.
Project the thinking expansion state into both rendering and height
estimation. Apply late measurement deltas only when the entire row is above
the viewport, and let those shifts invalidate stale snap-back targets.
Keep coalesced item-resize diagnostics behind the FlowChat diagnostics
switch. The probe records row identity, measurement geometry, and whether
compensation was applied without logging flow-item content.
Partly visible rows are intentionally left uncompensated. No persisted or
remote protocol shapes change.