TypeScript: add extensions to tsconfig and fix type errors (#12781)

* TypeScript: add extensions to tsconfig and fix type errors

- Add extensions/**/* to tsconfig.json includes
- Export ProviderAuthResult, AnyAgentTool from plugin-sdk
- Fix optional chaining for messageActions across channels
- Add missing type imports (MSTeamsConfig, GroupPolicy, etc.)
- Add type annotations for provider auth handlers
- Fix undici/fetch type compatibility in zalo proxy
- Correct ChannelAccountSnapshot property usage
- Add type casts for tool registrations
- Extract usage view styles and types to separate files

* TypeScript: fix optional debug calls and handleAction guards

extensions/zalo/src/proxy.ts

@@ -1,4 +1,4 @@
-import type { Dispatcher } from "undici";
+import type { Dispatcher, RequestInit as UndiciRequestInit } from "undici";
 import { ProxyAgent, fetch as undiciFetch } from "undici";
 import type { ZaloFetch } from "./api.js";
 
@@ -15,7 +15,10 @@ export function resolveZaloProxyFetch(proxyUrl?: string | null): ZaloFetch | und
   }
   const agent = new ProxyAgent(trimmed);
   const fetcher: ZaloFetch = (input, init) =>
-    undiciFetch(input, { ...init, dispatcher: agent as Dispatcher });
+    undiciFetch(input, {
+      ...init,
+      dispatcher: agent,
+    } as UndiciRequestInit) as unknown as Promise<Response>;
   proxyCache.set(trimmed, fetcher);
   return fetcher;
 }