feat(board): remove live widget preview, streamline integration editing

- Drop the narrow live preview panel from the widget picker (it kept
  rendering oversized widgets with errors) along with its translations
- The Edit integration tab now opens the connection editor directly when
  a widget has exactly one integration
- The connection editor closes on outside click
- Keep the save/cancel footer floating at the bottom of the editor

apps/nextjs/src/components/integration/embedded-integration-edit-modal.tsx

@@ -82,5 +82,5 @@ export const EmbeddedIntegrationEditModal = createModal<EmbeddedIntegrationEditM
   defaultTitle: (t) => t("item.edit.tab.integration"),
   size: modalSizeForm,
   presentation: "inspector",
-  closeOnClickOutside: false,
+  closeOnClickOutside: true,
 });