34f64e25f0cffa6b4ded5cbad1cdfbd1758fb82c  Unreviewed, address unexpected safer cpp regressions reported by post commit bots

Classified as not security-relevant.
Triage note: In buildSVGTextDisplayContent wraps inlineBox.style() with protect() and takes the InlineTextBox via CheckedRef instead of a raw reference; defensive smart-pointer tidy-up with no concrete bug fixed.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: smartptr_member_added (+3.0), area:Source/WebCore/layout (+2.0), surgical (+1.3)