96aed036df641ad9b132882fbe9ff47d1e10a521  [IFC] Compute style driven ink overflow in the integration layer instead of InlineDisplayContentBuilder

Classified as not security-relevant.
Triage note: Adds InlineLayoutState::contentMayHaveInkOverflow, stores glyph overflow bits on the display box, and moves collectInkOverflow* out of build(). Inline-layout ink-overflow/repaint refactor, no memory-safety bug.
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 (+6.47), null_guard (+2.59), clamp_saturate (+3.88), msg_medium (+2.0), msg_noise (-2.5), area:Source/WebCore/layout (+2.0), large_churn (-2.0)