Hard to imagine how a "...bad hose fitting under the dash" could result in dampness "...where the interior A-pillar trim meets the headliner and this was damp to the touch". Although the puddle on the mat sounds like it could not have come from anywhere else.
Does the car have a sunroof?
Was it a humid day and were you using the A/C? Several people have reported disconnected A/C condensate hoses, and that hose does exit on the passenger side.
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