[wieslawsoltes]

Problem and resulting behavior

Inline textual properties such as filter were stored by CSSOM but disappeared from computed style and retained paint after any later recascade. For example, setting element.style.filter = 'blur(4px)' left the retained scene at the stylesheet's brightness(0.5) value.

This change replays cold inline declarations through the existing one-node cascade, preserves author !important precedence, and reads computed effects from final cascaded state. It also corrects stale selector-specificity and mask-metadata assumptions in the effects fixture.

Closes #848.

Performance and validation

• no subtree recascade or mutation-lived winner cache;
• cold CSSOM writes use the existing one-node cascade;
• author-important scanning occurs only when replaying cold inline declarations;
• focused full-V8 gate passed with 4,096 effects, 100 selector cycles in 16.589s, 100 publication cycles in 4.037s, zero retained heap growth, and 22x16 localized blur damage;
• regression covers author !important override and inline restoration after stylesheet removal;
• git diff --check passed.