init: a Nitro preset inside a conditional spread reads as the build's preset #4107

Found in the #2167 research (notes/tanstack-start-top-ten.md). josephmqiu/game-theory-model's vite config:

nitro({ serverDir: "./server", ...(isElectronBuild ? { preset: "node-server" } : {}) })

startLayout (packages/cli/src/glue/start-layout.ts) matches preset: "node-server" with a regex, so init warns the preset starts its own server and drops NITRO_PRESET=standard, though the normal build sets no preset. Without the variable Nitro's default (node-server) builds a server the desktop can't mount.

Fix idea: only take a preset that is a direct property of the nitro({...}) call (not inside ...( / ?), else treat it as unset; one table row in the start-layout test.

Part of #2167.

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