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/number_input.tsx

@@ -0,0 +1,48 @@
+import { NumberInput } from '@mantine/core'
+
+interface FnNumberInputProps {
+  value?: number | string
+  onChange?: (value: number | string) => void
+  min?: number
+  max?: number
+  step?: number
+  label?: string
+  description?: string
+  error?: string
+  placeholder?: string
+  prefix?: string
+  suffix?: string
+}
+
+function FnNumberInput({
+  value,
+  onChange,
+  min,
+  max,
+  step,
+  label,
+  description,
+  error,
+  placeholder,
+  prefix,
+  suffix,
+}: FnNumberInputProps) {
+  return (
+    <NumberInput
+      value={value}
+      onChange={onChange}
+      min={min}
+      max={max}
+      step={step}
+      label={label}
+      description={description}
+      error={error}
+      placeholder={placeholder}
+      prefix={prefix}
+      suffix={suffix}
+    />
+  )
+}
+
+export { FnNumberInput }
+export type { FnNumberInputProps }