How is "until the end of the phase" not a duration window for the color change?
It may be... But if it is, what's the duration for Leia's ability itself?
There are two separate things going on here. Leia's ability that changes the color of all maneuvers while it is in effect, and the change, which stays in effect for some period of time. If effect, Triggering Leia's gives each ship the equivalent of Adrenaline Rush. But how long does that stay in effect?
I get what you're saying, but I think the card does explicitly lay out the duration of the effect. It's a stretch to think someone would be confused about the limitations of this one-use card.
...discard this card to allow all friendly ships that reveal a red maneuver to treat that maneuver as a white maneuver until the end of the phase."