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

src/plugins/types.ts

@@ -17,6 +17,7 @@ import type { WizardPrompter } from "../wizard/prompts.js";
 import type { PluginRuntime } from "./runtime/types.js";
 
 export type { PluginRuntime } from "./runtime/types.js";
+export type { AnyAgentTool } from "../agents/tools/common.js";
 
 export type PluginLogger = {
   debug?: (message: string) => void;