Telegram: remove @ts-nocheck from bot.ts, fix duplicate error handler, harden sticker caching (#9077)

* Telegram: remove @ts-nocheck from bot.ts and bot-message-dispatch.ts

- bot/types.ts: TelegramContext.me uses UserFromGetMe (Grammy) instead of manual inline type
- bot.ts: remove 6 unsafe casts (as any, as unknown, as object), use Grammy types directly
- bot.ts: remove dead message_thread_id access on reactions (not in Telegram Bot API)
- bot.ts: remove resolveThreadSessionKeys import (no longer needed for reactions)
- bot-message-dispatch.ts: replace ': any' with DispatchTelegramMessageParams type
- bot-message-dispatch.ts: add sticker.fileId guard before cache access
- bot.test.ts: update reaction tests, remove dead DM thread-reaction test

* Telegram: remove duplicate bot.catch handler (only the last one runs in Grammy)

* Telegram: remove @ts-nocheck from bot.ts, fix duplicate error handler, harden sticker caching (#9077)

src/telegram/bot-message-dispatch.ts

@@ -191,7 +191,7 @@ export const dispatchTelegramMessage = async ({
   // Handle uncached stickers: get a dedicated vision description before dispatch
   // This ensures we cache a raw description rather than a conversational response
   const sticker = ctxPayload.Sticker;
-  if (sticker?.fileUniqueId && ctxPayload.MediaPath) {
+  if (sticker?.fileId && sticker.fileUniqueId && ctxPayload.MediaPath) {
     const agentDir = resolveAgentDir(cfg, route.agentId);
     const stickerSupportsVision = await resolveStickerVisionSupport(cfg, route.agentId);
     let description = sticker.cachedDescription ?? null;