[andreivms]

Summary

Restore live tracked aria-hidden augmentations through the existing attribute helper before Modalizer disposal discards their storage. Otherwise, cancelling the pending hidden-update timer can leave outside content hidden after the last counted wrapper is removed.

Fixes #530.

The [Performance] title follows the contribution's investigation category; this is a functional cleanup fix, not a measured CPU improvement.

Evidence chain

Public modalizer hidden-update/disposal lifecycle context
-> source shows original attribute tracking discarded after cancelling the timer
-> real React last-wrapper removal leaves outside actions hidden
-> restore live tracked values through the existing helper before clearing storage

Implicated stacks during unresponsive renderer

Public ModalizerAPI.dispose and hidden-update traversal identify lifecycle context only. They do not prove live augmentation, assistive-technology incidence or renderer-CPU severity.

Baseline result

• Four absent/false-original last-wrapper scenarios no longer leave the outside actions aria-hidden and absent from the accessibility tree.
• Six retained-wrapper/deactivation controls retain their previous behavior.
• Two originally true-hidden controls intentionally remain hidden.
• Counted/shared and borrowed-core lifetime cases, detached live nodes and original attribute ownership are preserved.

Scope and limits

• Regression coverage includes shared/borrowed counted lifetimes, original absent/false/true values, detached live nodes and normal deactivation.
• Existing tracked weak references and the existing augmentation/restoration helper are reused; no traversal or lifetime cache is introduced.
• Actual screen-reader speech, permanent keyboard lock and production timing are not claimed.