feat(react/settings): port theme switch

apps/client/src/widgets/react/Column.tsx

@@ -0,0 +1,14 @@
+import type { ComponentChildren } from "preact";
+
+interface ColumnProps {
+    md: number;
+    children: ComponentChildren;
+}
+
+export default function Column({ md, children }: ColumnProps) {
+    return (
+        <div className={`col-md-${md}`}>
+            {children}
+        </div>
+    )
+}