Center yellow legend entry between green and red on radar screen
The yellow (mid-altitude) legend entry was pinned to a fixed 1/3-grid
column like the outer green/red entries, but its label ("3000-9100")
is noticeably longer than the others, making it sit visually too far
right - almost touching the red entry while leaving a lot of empty
space next to the short green label. Green and red keep their fixed
positions; yellow is now centered in the actual gap between them,
computed from gfx.textWidth() so it works correctly in both unit
modes (Metric and Imperial).
Refreshes firmware.bin to match this build.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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