Power, cadence and zone from your bike's ANT+ bridge, glanceable

Pulls power and cadence off a phone bridge and shows your current training zone as a single big number so you stop staring at the head unit on the trainer. Five-zone color band on a black background. I'm a mechanic, not a UI person, so feedback welcome.
Vertical gain and grade for trail runs, no looking down at a watch
Strength set timer that counts your rest so you don't doomscroll
Current direction and slack-water countdown for sea kayak training
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The five-zone color band saved me from interval guesswork, but Z3 and Z4 look almost identical on the additive display at speed. Could you make the zone letter bigger or swap the Z4 hue? Avg power readout is dead useful though.
Zone-as-one-big-number is the right call for the trainer, I stop chasing the head unit. One ask from a firmware angle: which ANT+ profile is the phone bridge speaking, standard power meter or the trainer's FE-C? Cadence held rock solid for me at 92.