Add a typed platform package to decouple the frontend from Tauri (#539)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

apps/yaak-client/lib/sendEphemeralRequest.ts

@@ -1,6 +1,6 @@
 import type { HttpRequest, HttpResponse } from "@yaakapp-internal/models";
 import { getActiveCookieJar } from "../hooks/useActiveCookieJar";
-import { invokeCmd } from "./tauri";
+import { rpc } from "./rpc";
 
 export async function sendEphemeralRequest(
   request: HttpRequest,
@@ -8,7 +8,7 @@ export async function sendEphemeralRequest(
 ): Promise<HttpResponse> {
   // Remove some things that we don't want to associate
   const newRequest = { ...request };
-  return invokeCmd("cmd_send_ephemeral_request", {
+  return rpc("cmd_send_ephemeral_request", {
     request: newRequest,
     environmentId,
     cookieJarId: getActiveCookieJar()?.id,