Fix overflow on location consent page

[JohnPalmer]

Prevents RenderFlex overflow by making the content scrollable while keeping bottom buttons fixed (small screens / large text).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.58%. Comparing base (7bd73ee) to head (b7ba289).
⚠️ Report is 6 commits behind head on offline_first.

Additional details and impacted files

@@                Coverage Diff                @@
##           offline_first     #680      +/-   ##
=================================================
+ Coverage          37.16%   37.58%   +0.41%     
=================================================
  Files                 26       26              
  Lines                896      886      -10     
=================================================
  Hits                 333      333              
+ Misses               563      553      -10     

Flag	Coverage Δ
unittests	37.58% <ø> (+0.41%)	⬆️

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Files with missing lines	Coverage Δ
lib/core/utils/style.dart	11.11% <ø> (+1.73%)	⬆️

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