Prevent checkbox / radio button icon from being clipped when label is long

When a checkbox or radio button had a label that filled the entire available
width, the icon would begin to shrink and would be clipped. The icon had a
preferred size set, but not a minimum size.

Set the minimum size to match the SVG, which means 16px.

Part of a fix for hypothesis/h#9635.

Author: robertknight

src/components/input/ToggleInput.tsx

@@ -91,7 +91,10 @@ export default function ToggleInput({
           // The ring needs to be applied here because the `input` has an
           // effectively-0 opacity.
           'peer-focus-visible:ring',
+          // Set preferred size of icon to match text.
           'w-em h-em',
+          // Set minimum size of icon to minimum size of SVG.
+          'min-w-min min-h-min',
         )}
       />
       {children}