fix(integrations): preserve Nextcloud subpaths (#6786)

* fix(integrations): preserve Nextcloud subpaths

* Keep existing Nextcloud DAV endpoints intact

---------

Co-authored-by: Artur <145776561+arturict@users.noreply.github.com>
Co-authored-by: arturict <arturict@users.noreply.github.com>

packages/integrations/src/nextcloud/nextcloud-url.ts

@@ -0,0 +1,13 @@
+export const createNextcloudCalendarServerUrl = (integrationUrl: string) => {
+  const calendarServerUrl = new URL(integrationUrl);
+  const integrationPath = calendarServerUrl.pathname.replace(/\/+$/, "");
+  const davPath = "/remote.php/dav";
+
+  calendarServerUrl.pathname = integrationPath.endsWith(davPath)
+    ? `${integrationPath}/`
+    : `${integrationPath}${davPath}/`;
+  calendarServerUrl.search = "";
+  calendarServerUrl.hash = "";
+
+  return calendarServerUrl.toString();
+};