feat(analytics): proxy PostHog ingestion through public-api on Vercel

- Add Vercel rewrites to proxy `/ingest/*` and `/ingest/static/*` to PostHog's US endpoints
- Update native `.env.example` to point `EXPO_PUBLIC_POSTHOG_HOST` at the self-hosted proxy URL

packages/i18n/src/po/en.po

@@ -1650,6 +1650,10 @@ msgstr ""
 msgid "Play trailer"
 msgstr ""
 
+#: apps/native/src/hooks/use-server-connection.ts
+msgid "Please sign in again."
+msgstr "Please sign in again."
+
 #: apps/native/src/app/(tabs)/(explore)/index.tsx
 #: apps/web/src/routes/_app/explore.tsx
 msgid "Popular Movies"
@@ -2091,6 +2095,10 @@ msgstr ""
 msgid "Server URL"
 msgstr ""
 
+#: apps/native/src/hooks/use-server-connection.ts
+msgid "Session expired"
+msgstr "Session expired"
+
 #: apps/native/src/app/(tabs)/(settings)/index.tsx
 msgid "Set password"
 msgstr ""