Two remaining proportion issues on the user's device:
1. Right-side gap: the three grid rows used a continuous Row
(60+200+60dp), leaving ~84px of blank space on the right of the
screen. The reference app uses a RelativeLayout where the right
column is pinned to the screen edge and the 20dp gaps sit on both
sides of the centered middle column. Convert each row to a Box:
left cell align(CenterStart), middle cell align(Center), right
cell align(CenterEnd) - pixel-identical to the reference.
2. Footer legibility: the credit line ("制作：US1PM 汉化：BA7LCE")
had a fixed 15dp height with no bottom margin, so it sat directly
against the navigation bar and part of the text was hard to read.
Drop the fixed height and add 10dp bottom padding so the text
renders fully with breathing room above the nav bar.
Verified: feature + app compile, 11 unit tests pass. Marker lookup,
grid math and GPS logic untouched.
mckero
f06b17a194