Fix duplicate SelectionObserver instantiation #1466
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What
Consolidates selection-related side effects under a single
SelectionObserver instance.
Why
TextSelectionManager was creating multiple SelectionObserver instances
for the same layer. This change avoids duplicate observers and ensures
consistent attach/detach behavior.
Scope
No user-visible behavior change intended.
Notes
Adds a type guard to ensure
classListis accessed only on Element nodeswhen walking the DOM.