core(renderer): add resize-reset for split-footer#1096
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When screenMode is "split-footer" and externalOutputMode is "capture-stdout", treat resize as destructive: on the first event in a burst, scroll the upper pane into history, clear the footer area, and buffer further output. Subsequent events in the same burst only update target dimensions, scrolling any newly revealed rows to keep the viewport blank. Once debounce settles, apply the final geometry once, reset split scrollback from origin, and force a full repaint. You get a clean footer after the user stops dragging. SPLIT_FOOTER_RESIZE_RESET exposes burst-start/update/settle/cancel phases for instrumentation.
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When screenMode is "split-footer" and externalOutputMode is "capture-stdout", treat resize as destructive: on the first event in a burst, scroll the upper pane into history, clear the footer area, and buffer further output. Subsequent events in the same burst only update target dimensions, scrolling any newly revealed rows to keep the viewport blank. Once debounce settles, apply the final geometry once, reset split scrollback from origin, and force a full repaint.
You get a clean footer after the user stops dragging. SPLIT_FOOTER_RESIZE_RESET exposes burst-start/update/settle/cancel phases for instrumentation.