[oddurs]

Problem

Spotlight converts units ("10 km to mi") and people use it for exactly that. Without it, Common Command left a reason to keep Spotlight around.

Approach

Converter.convert reads <amount> <unit> to|in|as|into|=|→ <unit>, searching for the separator from the right so "5 in in cm" works. The unit is the longest known name the left side ends with, so "10km" and "10 km" both work. The amount goes through the calculator (Calculator.value(of:requiringOperation: false)), so it can be arithmetic ("6*12 in to cm") and follows the region's decimal separator.

Factors come from Foundation's Dimension converters: length, mass, temperature, volume, speed, area, data (decimal KB/MB/GB as Finder counts, plus KiB/MiB/GiB), duration (days and weeks added as linear units), and angle. Both units must be the same kind; "10 km to kg" is not a conversion.

The result sits where calculations do, shown and copied to six significant figures ("70 f in c" → "= 21.1111 °C"). It turns off with the Calculator setting.

Look at sceptically

• "cup" is Foundation's 240 ml US legal cup, not the 236.6 ml customary cup. Both are real; the test pins the Foundation one.
• Single-letter units (m, g, c, f, k, s, h, t, d) are accepted only after an amount and before/after a separator, so ordinary searches are untouched; leavesEverythingElseAlone covers the obvious cases, but there may be a phrase where a number and two letters collide.
• No currency: it needs exchange rates from the network, and the app makes no connections of its own.

Checklist

• scripts/task check passes locally
• UI reviewed with --snapshot ("70 f in c")