fix(BaseTable): adaptive row virtualization improvements

[kseniya57]

• Memoize headers and stabilize default row-model factories to reduce unnecessary renders while preserving updates on table state changes.
• Remove stale measurement-cache entries when a row element is rebound to a new virtual key.
• Synchronously measure newly mounted or realized rows without cached sizes in direct DOM update mode to prevent overlapping rows.
• Support the table body itself as a horizontal scroll container for offscreen cell-content deferral.
• Reuse valid paint tickets and prevent premature realization of deferred rows. Preserve recovery budgets across overlapping callbacks and prioritize visible rows after scrolling stops.
• Retain recently mounted rows within a bounded range during scrolling and complete incremental cleanup after scrolling stops.

[gravity-ui-bot]

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