feat(sessions): add referrer to session modal

Display the initial referrer in the Session modal properties grid.
Fetches the referrer from the session's first event to show where
the user originally came from.

src/app/(main)/websites/[websiteId]/sessions/SessionInfo.tsx

@@ -2,6 +2,7 @@ import { ReactNode } from 'react';
 import { Icon, Grid, Column, Row, Label } from '@umami/react-zen';
 import { useFormat, useLocale, useMessages, useRegionNames } from '@/components/hooks';
 import { TypeIcon } from '@/components/common/TypeIcon';
+import { Favicon } from '@/components/common/Favicon';
 import { KeyRound, Calendar, MapPin, Landmark } from '@/components/icons';
 import { DateDistance } from '@/components/common/DateDistance';
 
@@ -60,6 +61,10 @@ export function SessionInfo({ data }) {
       >
         {formatValue(data?.device, 'device')}
       </Info>
+
+      <Info label={formatMessage(labels.referrer)} icon={<Favicon domain={data?.referrerDomain} />}>
+        {data?.referrerDomain}
+      </Info>
     </Grid>
   );
 }

src/queries/sql/sessions/getWebsiteSession.ts

@@ -32,7 +32,13 @@ async function relationalQuery(websiteId: string, sessionId: string) {
       count(distinct visit_id) as visits,
       sum(views) as views,
       sum(events) as events,
-      sum(${getTimestampDiffSQL('min_time', 'max_time')}) as "totaltime" 
+      sum(${getTimestampDiffSQL('min_time', 'max_time')}) as "totaltime",
+      (select referrer_domain
+       from website_event
+       where website_id = {{websiteId::uuid}}
+         and session_id = {{sessionId::uuid}}
+       order by created_at asc
+       limit 1) as "referrerDomain"
     from (select
           session.session_id as id,
           session.distinct_id,
@@ -83,7 +89,13 @@ async function clickhouseQuery(websiteId: string, sessionId: string) {
       uniq(visit_id) visits,
       sum(views) as views,
       sum(events) as events,
-      sum(max_time-min_time) as totaltime
+      sum(max_time-min_time) as totaltime,
+      (select referrer_domain
+       from website_event
+       where website_id = {websiteId:UUID}
+         and session_id = {sessionId:UUID}
+       order by created_at asc
+       limit 1) as referrerDomain
     from (select
               session_id as id,
               distinct_id as distinctId,