Migration of jsx files to tsx 3 (#851)

This is in continue to:
- #850
- #848

The last files should be converted as part of this PR, there are only a
handful left.

src/components/SpecField.tsx

@@ -13,6 +13,7 @@ const typeMap = {
   number: () => Block,
   string: () => Block,
   formatted: () => Block,
+  padding: () => Block,
 };
 
 export type SpecFieldProps = InputFieldSpecProps & {