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

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

apps/yaak-client/routes/__root.tsx

@@ -1,6 +1,6 @@
 import { QueryClientProvider } from "@tanstack/react-query";
 import { createRootRoute, Outlet } from "@tanstack/react-router";
-import { type } from "@tauri-apps/plugin-os";
+import { platform } from "@yaakapp-internal/platform";
 import classNames from "classnames";
 import { Provider as JotaiProvider } from "jotai";
 import { LazyMotion, MotionConfig } from "motion/react";
@@ -46,7 +46,7 @@ function RouteComponent() {
 function Layout() {
   return (
     <div
-      className={classNames("w-full h-full", type() === "linux" && "border border-border-subtle")}
+      className={classNames("w-full h-full", platform.osType() === "linux" && "border border-border-subtle")}
     >
       <Outlet />
     </div>