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refactor(perf): Unify cache invalidation strategy with generation counters (#4125)

- Rename tickSizeGeneration → redrawGeneration for clarity
- Introduce dataGeneration counter for data/visibility-dependent caches
- Replace _visibilityChecksum with dataGeneration-based invalidation
- Add generation-stamped caching for maxDataCountTarget, filteredTargets, valuesXIndexMap
- Cache getDrawShape() result in generateRedrawList when data unchanged
- Clean up _cachedDrawShape in afterRedraw to release closures

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