There's a fine line between ambitious and implausible, and Dreame's latest EV concept doesn't so much walk that line as launch itself clear over it. Unveiled Monday at the Palace of Fine Arts in San Francisco, the Nebula Next 01 Jet Edition arrives with an absurd claim that's hard to ignore and even harder to take at face value: a sub-1-second sprint to 62 mph, achieved not just through electric propulsion, but with the aid of solid-state rocket boosters. It's the kind of pitch designed to make everyone stop and take notice -- and to be fair, it did -- but once the initial shock wears off, the questions start to stack up quickly. Dreame, a Chinese company best known in the US for its  excellent robot vacuums , is the force behind the automotive offshoot Nebula. That pivot alone might raise eyebrows, but it's not without precedent.  Dyson famously explored  building an EV before abandoning the effort in 2019, and today's landscape is far more forgiving to nontraditional entrants.…