ui: consistent offroad/onroad timings

[sshane]

One frame drop in 15m, still working on it. Most on this PR is debugging, not final, to be split out.

• No display/vsync drift from letting raylib sleep which mismatched display refresh ever so slightly, which caused drops multiple times per second to every few seconds.
• Higher prio than plannerd.
• On interaction timeout, onboarding widget could cause up to 20ms from writing param blocking.
• Brightness updates took 2ms creating threads. Now no jumps.
• Occasional param reading in main thread caused few ms jump as well, in thread no jump (not holding GIL, but also not on core 5).
• No clue why timings shift over time still, look at modeld
• I had to disable tmux status updating every 15s for test, caused +1ms spikes: tmux set -g status-interval 0

This PR:

Master:

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[sshane]

version shouldn't change, remove