fix(sdk-lib-mpc): add type shim for @bitgo/wasm-mps/web subpath

moduleResolution:node cannot resolve package.json subpath exports.
Adds an ambient module declaration so TypeScript accepts the
@bitgo/wasm-mps/web import that webpack resolves via its alias.

Ticket: WCI-251

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Marzooqa

modules/sdk-lib-mpc/src/tss/eddsa-mps/wasm-mps-web.d.ts

@@ -0,0 +1,10 @@
+// Type shim for @bitgo/wasm-mps/web subpath export.
+// moduleResolution:node cannot resolve package.json subpath exports;
+// this declaration bridges the gap until the project upgrades to node16/bundler.
+import type * as WasmMpsMain from '@bitgo/wasm-mps';
+
+declare module '@bitgo/wasm-mps/web' {
+  export * from '@bitgo/wasm-mps';
+  const init: () => Promise<void>;
+  export default init;
+}