I used to leave all struts inflated and LE deflated, rolling the kite, then leave it vertical into the shower, LE up.
Do not roll it up to tight otherwise it will never get dry.
if not dried properly and wet with fresh water, then you get stains, no problems with salt water insted.
This is how I do it too
But only to take the worst risk of colour smearing/bleeding away - as there is still a small risk because some of the canopy might "cling" together with the rain drops/water in between
I have never had a wet kite with salt water, as it can be dried very fast if you just put the kite up in the air for a while - which I assume most of us do to dry the kite
And salt water, as you also point out, should not be the same issue regarding colour smearing - although I would dry my kite anyways as soon as possible.
But if raining even ever so slightly maybe even only when packing down - the kite will be wet and in risk of color stains when packed or rolled up
The risk is VERY small though - it happens quite rare.
Unfortunately, even if it only happens one out of 100 times maybe, it might happen tomorrow if you leave it wet (rain) when packed or rolled