Rich integration

// Use in place of the ordinary handler; bot and sk are initialized.
bot.use(sk.callbacks({
  onError: () => console.error("Ad interaction failed"),
}));

bot.on("message:text", async (ctx) => {
  if (ctx.chat.type !== "private") return;
  const reply = await getLlmResponse(ctx.message.text); // Return plain text.
  const result = await sk.inject({
    userId: ctx.from.id,
    message: reply,
    languageCode: ctx.from.language_code || "en",
    acceptFormats: ["text", "response", "card", "consent", "quiz"],
    capabilities: {
      richMessages: true,
      callbacks: true,
      customEmoji: false,
    },
  });

  if (result.send) {
    await ctx.reply(reply);
    // If rich delivery fails, send only the ad as text.
    const adOnly = {
      ...result,
      message: "Ad\n" + (result.ad?.text ?? ""),
    };
    const raw = ctx.api.raw as unknown as Record<
      string, (params: Record<string, unknown>) => Promise<unknown>
    >;
    const delivered = await sk.send(
      (method, params) => raw[method](params),
      ctx.chat.id,
      adOnly,
    );
    if (delivered === null) {
      console.error("Ad delivery failed");
    }
  } else {
    await ctx.reply(result.message, {
      reply_markup: result.keyboard ?? undefined,
    });
  }
});