feat(preset-mini): negate math function values

[chu121su12]

Globally negate value if within calc, clamp, min, or max functions. There are var and env too but for now the code follows the handler code:

unocss/packages/preset-mini/src/_utils/handlers/handlers.ts

Line 126 in 76b883f

.replace(/(?:calc|clamp|max|min)\((.*)/g, (v) => {

To hint var/env to be able to be negated, for now use calc(var()) as in tests.

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