Fix nearby-group sorting by removing float-to-int comparator truncation

[Copilot]

findNearbyGroups was sorting by int(distanceToA - distanceToB), which collapses sub-unit distance differences to 0 and can treat distinct groups as equal. That can produce unstable/incorrect ordering for close contacts.

• Comparator correctness
  • Replaced truncating subtraction-based comparator with a float-safe comparison in pkg/radar/nearby.go.
  • This preserves strict ordering for small distance deltas and avoids accidental ties.

slices.SortFunc(groups, func(a, b *group) int {
    distanceToA := spatial.Distance(pointOfInterest, a.point(), r.withProjection())
    distanceToB := spatial.Distance(pointOfInterest, b.point(), r.withProjection())
    return cmp.Compare(distanceToA, distanceToB)
})

> [!WARNING]
>
>

[dharmab]

Excessive testing, remove tests

[Copilot]

Removed pkg/radar/nearby_test.go as requested in commit 1e6ef2b.

[Copilot]

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