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/feishu/src/onboarding.ts

@@ -80,7 +80,10 @@ async function promptFeishuAllowFrom(params: {
     }
 
     const unique = [
-      ...new Set([...existing.map((v) => String(v).trim()).filter(Boolean), ...parts]),
+      ...new Set([
+        ...existing.map((v: string | number) => String(v).trim()).filter(Boolean),
+        ...parts,
+      ]),
     ];
     return setFeishuAllowFrom(params.cfg, unique);
   }