feat(telegram): add sendPoll support (#16193) (#16209)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: b58492cfed
Co-authored-by: robbyczgw-cla <239660374+robbyczgw-cla@users.noreply.github.com>
Co-authored-by: steipete <58493+steipete@users.noreply.github.com>
Reviewed-by: @steipete

src/discord/send.outbound.ts

@@ -274,12 +274,15 @@ export async function sendPollDiscord(
   const { channelId } = await resolveChannelId(rest, recipient, request);
   const content = opts.content?.trim();
   const payload = normalizeDiscordPollInput(poll);
+  // Discord message flag for silent/suppress notifications (matches send.shared.ts)
+  const flags = opts.silent ? 1 << 12 : undefined;
   const res = (await request(
     () =>
       rest.post(Routes.channelMessages(channelId), {
         body: {
           content: content || undefined,
           poll: payload,
+          ...(flags ? { flags } : {}),
         },
       }) as Promise<{ id: string; channel_id: string }>,
     "poll",