fix(facts): use vertical m for submarine rangefinder distance facts

[Bartok9]

Summary

• Set SubmarineFact rangefinderDistance and rangefinderTarget units to vertical m.

Motivation

ROV rangefinder range/target are vertical-axis lengths. Plain m skips Vertical Distance unit conversion.

Verification

• JSON OK; two unit fields only
• No vehicle control changes

Notes

AI-assisted; human-reviewed. Complements prior vertical-m fact work (DonLakeFlyer coalesce credited earlier merges).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.20%. Comparing base (f29efd3) to head (82bb408).
⚠️ Report is 141 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14620      +/-   ##
==========================================
+ Coverage   25.47%   31.20%   +5.73%     
==========================================
  Files         769      785      +16     
  Lines       65912    66906     +994     
  Branches    30495    31007     +512     
==========================================
+ Hits        16788    20879    +4091     
+ Misses      37285    31822    -5463     
- Partials    11839    14205    +2366     

Flag	Coverage Δ
unittests	31.20% <ø> (+5.73%)	⬆️

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see 445 files with indirect coverage changes

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