fix(facts): use SI capital V for battery voltage units

[Bartok9]

Battery voltage fact used units "v" while Esc/Generator voltage facts use "V". Align battery metadata unit casing to SI capital V.

No conversion table change expected; Fact units string only.

AI-assisted; human-reviewed. Path-orthogonal to other fact PRs tonight.

[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Passed	View

All builds passed.

Pre-commit

Check	Status	Details
pre-commit	Failed (non-blocking)	View

Pre-commit hooks: 0 passed, 0 failed, 0 skipped.

Test Results

linux-coverage-integration: 33 passed, 0 skipped
linux-coverage-unit: 107 passed, 0 skipped
Total: 140 passed, 0 skipped

Code Coverage

Coverage: 67.8%

No baseline available for comparison

Artifact Sizes

Artifact	Size
QGroundControl	221.83 MB
QGroundControl-aarch64	179.42 MB
QGroundControl-installer-AMD64	137.93 MB
QGroundControl-installer-AMD64-ARM64	80.45 MB
QGroundControl-installer-ARM64	109.22 MB
QGroundControl-linux	87.10 MB
QGroundControl-mac	87.09 MB
QGroundControl-windows	86.16 MB
QGroundControl-x86_64	191.65 MB
No baseline available for comparison

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_{Updated: 2026-07-19 05:15:20 UTC • Commit: 24723f4 • Triggered by: Android}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.59%. Comparing base (f29efd3) to head (24723f4).
⚠️ Report is 156 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14637      +/-   ##
==========================================
+ Coverage   25.47%   31.59%   +6.12%     
==========================================
  Files         769      785      +16     
  Lines       65912    66985    +1073     
  Branches    30495    31029     +534     
==========================================
+ Hits        16788    21163    +4375     
+ Misses      37285    31429    -5856     
- Partials    11839    14393    +2554     

Flag	Coverage Δ
unittests	31.59% <ø> (+6.12%)	⬆️

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see 455 files with indirect coverage changes

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[Bartok9]

Consolidating per @DonLakeFlyer's request into a single PR: #14651. Closing this one. Thanks!