perf(blacklist): request data only when modal is shown

For admin users, the button to blacklist a media (used on every media card) was displaying a Modal,
that was requesting data BEFORE the modal was displayed. This resulted in dozens of additional
requests everytime media cards were displayed.

src/components/BlacklistModal/index.tsx

@@ -38,7 +38,7 @@ const BlacklistModal = ({
   const intl = useIntl();
 
   const { data, error } = useSWR<TvDetails | MovieDetails>(
-    `/api/v1/${type}/${tmdbId}`
+    show ? `/api/v1/${type}/${tmdbId}` : null
   );
 
   return (

src/components/Login/JellyfinLogin.tsx

@@ -82,10 +82,17 @@ const JellyfinLogin: React.FC<JellyfinLoginProps> = ({
       port: Yup.number().required(
         intl.formatMessage(messages.validationPortRequired)
       ),
-      urlBase: Yup.string().matches(
-        /^(.*[^/])$/,
-        intl.formatMessage(messages.validationUrlBaseTrailingSlash)
-      ),
+      urlBase: Yup.string()
+        .test(
+          'leading-slash',
+          intl.formatMessage(messages.validationUrlBaseLeadingSlash),
+          (value) => !value || value.startsWith('/')
+        )
+        .test(
+          'trailing-slash',
+          intl.formatMessage(messages.validationUrlBaseTrailingSlash),
+          (value) => !value || !value.endsWith('/')
+        ),
       email: Yup.string()
         .email(intl.formatMessage(messages.validationemailformat))
         .required(intl.formatMessage(messages.validationemailrequired)),