fix(units): convert km/J from the m/J Signal K delivers

[mairas]

Signal K delivers energy-distance paths in m/J, but the km/J converter in UnitsService went from km/J to km/J, which is the identity, so any value shown in km/J was 1000 times too large (issue 670). It now converts from m/J, like its nm/J and km/kWh neighbours.

The v22 migration's frozen factor table in config-migration.util.ts keeps its identity entry for km/J, as the issue asks: it rescales bounds users entered while the renderer showed the identity values.

npm run ci passes: 3278 unit tests and 40 schema tests. The new test (1500 m/J → 1.5 km/J, 1852 m/J → 1 nm/J) failed before the fix.

Closes #670

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https://claude.ai/code/session_01GKFfJCv7rbzXcAYj1DZocd

When the app displays energy distance values in km/J, it now converts Signal K’s m/J values to km/J instead of displaying them unchanged. Tests also check conversion to km/J and nm/J.

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Reviewing files that changed from the base of the PR and between 55799ac and 2cda27c.

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📒 Files selected for processing (2)

• src/app/core/services/units.service.spec.ts
• src/app/core/services/units.service.ts

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📝 Walkthrough

📝 Walkthrough

Walkthrough

The km/J converter now converts values from m/J to km/J. A test checks the conversion results for km/J and nm/J.

Changes

Energy-distance conversion

Layer / File(s)	Summary
Correct km/J conversion and verify scales src/app/core/services/units.service.ts, src/app/core/services/units.service.spec.ts	The km/J converter now uses m/J as its source unit. The test checks that 1,500 m/J converts to 1.5 km/J, and 1,852 m/J converts to 1 nm/J.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix · Severity of issue fixed: Medium

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Merge Risk: 🔵 Low · up to 55799

The conversion correction is in place; the remaining concern is a brittle test tolerance, which could cause unnecessary test failures but does not establish a production conversion failure.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title uses conventional-commit form and clearly describes the km/J conversion from m/J supplied by Signal K.
Linked Issues check		Issue [#670] requires km/J to convert from Signal K's m/J input and requires the v22 frozen km/J factor to remain identity. UnitsService now uses Qty.swiftConverter('m/J', 'km/J'). `V22_MEAS…
Out of Scope Changes check		The pull request changes only the energy-distance converter and adds its regression test. Both changes directly support issue [#670]. No unrelated change is demonstrated.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/app/core/services/units.service.spec.ts:
- Around line 273-274: Adjust the convertToUnit assertions for km/J and nm/J to
allow insignificant floating-point rounding while still distinguishing incorrect
unit scales; avoid requiring exact nine-decimal precision.

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📒 Files selected for processing (2)

• src/app/core/services/units.service.spec.ts
• src/app/core/services/units.service.ts

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[mairas]

Amended the PR commit and force-pushed it with a lease, as 2cda27c6. It addresses CodeRabbit's tolerance comment: the km/J and nm/J assertions now use three decimals instead of nine, which still catches the 1000× scale bug. It changes the test only. The units spec passes (75 tests), and so does lint.