ce81c080a3d3  [AppKit Gestures] Mouse dragging the track of a custom-styled range input often does not slide

Classified as not security-relevant.
Triage note: Adds WebEventInputSource::Automation plumbing to InteractionInformationRequest and an automationAdjustedInteractionLocation (snapping synthesized mouse-down near range inputs) with distance/bounds clamps. WebDriver/automation feature, no security 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 (+4.87), null_guard (+1.95), area:Source/WebCore/dom (+2.0)