Support infinite voting time for remote polls

Signed-off-by: Marcin Mikołajczak <git@mkljczk.pl>

src/components/polls/poll-footer.tsx

@@ -82,7 +82,7 @@ const PollFooter: React.FC<IPollFooter> = ({ poll, showResults, selected }): JSX
           {votesCount}
         </Text>
 
-        {poll.expires_at && (
+        {poll.expires_at !== null && (
           <>
             <Text theme='muted'>&middot;</Text>
             <Text weight='medium' theme='muted' data-testid='poll-expiration'>{timeRemaining}</Text>

src/schemas/poll.ts

@@ -14,7 +14,7 @@ const pollOptionSchema = z.object({
 const pollSchema = z.object({
   emojis: filteredArray(customEmojiSchema),
   expired: z.boolean().catch(false),
-  expires_at: z.string().datetime().catch(new Date().toUTCString()),
+  expires_at: z.string().datetime().nullable().catch(null),
   id: z.string(),
   multiple: z.boolean().catch(false),
   options: z.array(pollOptionSchema).min(2),