initial: mirror of @fn_library from fn_registry

75 components + DESIGN_SYSTEM.md + sync script.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

components/pin_input.tsx

@@ -0,0 +1,10 @@
+import { PinInput as MantinePinInput, type PinInputProps as MantinePinInputProps } from '@mantine/core'
+
+interface PinInputProps extends MantinePinInputProps {}
+
+function PinInput(props: PinInputProps) {
+  return <MantinePinInput {...props} />
+}
+
+export { PinInput }
+export type { PinInputProps }