Service worker build ignores vite build.target and esbuild options

### Describe the bug `build_service_worker()` runs a separate `vite.build()` with `configFile: false`. It forwards `define` and `build.minify` from the main Vite config, but not `build.target` or `esbuild`. As a result, user overrides in `vite.config.js` (e.g. `build.target: "es2022"`, `esbuild.supported.destructuring`) apply to the main client build but not to the service worker build. With `esbuild@0.28.x` this causes the service worker build to fail (https://github.com/evanw/esbuild/issues/4436): ``` [vite:esbuild-transpile] Transform failed with N errors: service-worker.mjs:158:10: ERROR: Transforming destructuring to the configured target environment ("chrome87", "edge88", "es2020", "firefox78", "safari14" + 2 overrides) is not supported yet ``` ### Reproduction 1. Open https://stackblitz.com/edit/service-worker-build-error?file=package.json 2. Run `npm run build` ### Logs ```Shell ``` ### System Info ```Shell System: OS: Linux 7.0 Fedora Linux 44 (KDE Plasma Desktop Edition) CPU: (12) x64 AMD Ryzen 5 7500F 6-Core Processor Memory: 15.52 GB / 31.05 GB Container: Yes Shell: 5.9 - /usr/bin/zsh Binaries: Node: 24.14.0 - /home/envyvox/.local/share/pnpm/node Yarn: 1.22.22 - /usr/local/bin/yarn npm: 11.9.0 - /home/envyvox/.local/share/pnpm/npm pnpm: 10.32.1 - /home/envyvox/.local/share/pnpm/pnpm Browsers: Chrome: 149.0.7827.53 Firefox: 151.0.3 Firefox Developer Edition: 151.0.3 npmPackages: @sveltejs/adapter-node: 5.4.0 => 5.4.0 @sveltejs/kit: 2.57.1 => 2.57.1 @sveltejs/mcp: 0.1.20 => 0.1.20 @sveltejs/vite-plugin-svelte: 6.1.4 => 6.1.4 svelte: 5.55.5 => 5.55.5 vite: 6.4.2 => 6.4.2 ``` ### Severity serious, but I can work around it ### Additional Information _No response_