fix(react-router): set a default transformer during router instantiation

[SeanCassiere]

This affected anyone trying to use the basic-ssr-file-based example as a starting point.

[nx-cloud]

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• nx affected --targets=test:eslint,test:unit,test:e2e,test:types,test:build,build --parallel=3
• nx run-many --target=build --exclude=examples/**

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[pkg-pr-new]

commit: 3caa6f8

@tanstack/history

pnpm add https://pkg.pr.new/@tanstack/history@2097

@tanstack/react-cross-context

pnpm add https://pkg.pr.new/@tanstack/react-cross-context@2097

@tanstack/react-router

pnpm add https://pkg.pr.new/@tanstack/react-router@2097

@tanstack/react-router-with-query

pnpm add https://pkg.pr.new/@tanstack/react-router-with-query@2097

@tanstack/router-cli

pnpm add https://pkg.pr.new/@tanstack/router-cli@2097

@tanstack/router-devtools

pnpm add https://pkg.pr.new/@tanstack/router-devtools@2097

@tanstack/router-generator

pnpm add https://pkg.pr.new/@tanstack/router-generator@2097

@tanstack/router-plugin

pnpm add https://pkg.pr.new/@tanstack/router-plugin@2097

@tanstack/router-vite-plugin

pnpm add https://pkg.pr.new/@tanstack/router-vite-plugin@2097

@tanstack/start

pnpm add https://pkg.pr.new/@tanstack/start@2097

@tanstack/start-vite-plugin

pnpm add https://pkg.pr.new/@tanstack/start-vite-plugin@2097

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