refactor: repartition server-side and client-side code

app/.client/components/ui/Popover.tsx

@@ -0,0 +1,29 @@
+import * as Popover from '@radix-ui/react-popover';
+import type { PropsWithChildren, ReactNode } from 'react';
+
+export default ({
+  children,
+  trigger,
+  side,
+  align,
+}: PropsWithChildren<{
+  trigger: ReactNode;
+  side: 'top' | 'right' | 'bottom' | 'left' | undefined;
+  align: 'center' | 'start' | 'end' | undefined;
+}>) => (
+  <Popover.Root>
+    <Popover.Trigger asChild>{trigger}</Popover.Trigger>
+    <Popover.Anchor />
+    <Popover.Portal>
+      <Popover.Content
+        sideOffset={10}
+        side={side}
+        align={align}
+        className="bg-upage-elements-background-depth-2 text-upage-elements-item-contentAccent p-2 rounded-md shadow-xl z-workbench"
+      >
+        {children}
+        <Popover.Arrow className="bg-upage-elements-item-background-depth-2" />
+      </Popover.Content>
+    </Popover.Portal>
+  </Popover.Root>
+);