feat(mui): kit — Select, StatusChip, CheckboxField, Alert

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/ui/StatusChip.tsx

@@ -0,0 +1,27 @@
+import Chip, { type ChipProps } from "@mui/material/Chip";
+
+type StatusChipProps = Omit<ChipProps, "color"> & {
+  color?: "default" | "success" | "error" | "warning" | "info";
+};
+
+/** Semantic status chip. Pass onClick to make it a clickable toggle. */
+export default function StatusChip({
+  color = "default",
+  size = "small",
+  onClick,
+  sx,
+  ...props
+}: StatusChipProps) {
+  return (
+    <Chip
+      color={color}
+      size={size}
+      onClick={onClick}
+      sx={[
+        { fontWeight: 600, ...(onClick ? { cursor: "pointer" } : {}) },
+        ...(Array.isArray(sx) ? sx : [sx]),
+      ]}
+      {...props}
+    />
+  );
+}