fix(ItemBase): tooltip logic

[tenphi]

Note

Refactors auto-tooltip overflow detection to use an internal element ref and properly forward external label refs via callback, tightening observer lifecycle.

• ItemBase useAutoTooltip:
  • Replace useCombinedRefs with explicit external ref forwarding: call labelProps.ref in handleLabelElementRef and manage internal elementRef.
  • Use elementRef for overflow checks; simplify checkLabelOverflow deps.
  • Rework ResizeObserver wiring: recreate/disconnect on node changes; store in resizeObserverRef.
  • Cleanup updates: null out elementRef on unmount.
  • Minor renames (observedElementRef -> elementRef), dependency list updates, and ref prop removal preserved in finalLabelProps.

^{Written by Cursor Bugbot for commit 4437379. This will update automatically on new commits. Configure here.}

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