chore(test): silence vite 8 deprecation warnings in the sim vitest config

@vitejs/plugin-react v4 targets pre-rolldown Vite: it sets `esbuild.jsx`
and `optimizeDeps.rollupOptions`, both deprecated under Vite 8's oxc
pipeline, and self-reports that plugin-react-oxc should be used instead.
v6 is that plugin merged back under the original name — it requires Vite
^8, drops Babel entirely, and emits none of those options.

Vite 8 also resolves tsconfig paths natively, so vite-tsconfig-paths is
replaced by `resolve.tsconfigPaths`.

Full apps/sim suite unchanged: 1483 passed / 2 skipped files,
20415 passed / 30 skipped tests.

Author: waleedlatif1

apps/sim/package.json

@@ -261,13 +261,12 @@
     "@types/react-dom": "^19",
     "@types/ssh2": "^1.15.5",
     "@types/three": "0.177.0",
-    "@vitejs/plugin-react": "^4.3.4",
+    "@vitejs/plugin-react": "^6.0.5",
     "@vitest/coverage-v8": "^4.1.0",
     "postcss": "^8",
     "react-email": "6.9.0",
     "tailwindcss": "^3.4.1",
     "typescript": "^7.0.2",
-    "vite-tsconfig-paths": "^5.1.4",
     "vitest": "^4.1.0"
   }
 }

apps/sim/vitest.config.ts

@@ -1,7 +1,6 @@
 import path from 'path'
 /// <reference types="vitest" />
 import react from '@vitejs/plugin-react'
-import tsconfigPaths from 'vite-tsconfig-paths'
 import { configDefaults, defineConfig } from 'vitest/config'
 
 const nextEnv = require('@next/env')
@@ -11,7 +10,7 @@ const projectDir = process.cwd()
 loadEnvConfig(projectDir)
 
 export default defineConfig({
-  plugins: [react(), tsconfigPaths()],
+  plugins: [react()],
   test: {
     globals: true,
     environment: 'node',
@@ -27,6 +26,7 @@ export default defineConfig({
     testTimeout: 10000,
   },
   resolve: {
+    tsconfigPaths: true,
     alias: [
       {
         find: '@sim/db',