Set the app-wide default mini expand-on-hover dwell - enterDelay (ms before
the rail expands) and leaveDelay (ms before it collapses). Flows into the
composed CngxHoverIntent via CNGX_HOVER_INTENT_DEFAULTS. Per-instance
[enterDelay] / [leaveDelay] still win; the shipped literals (120 / 0)
apply when neither is set. Partial payloads deep-merge, so pass only the key
you want to change.