[PoC] React Router migration (preview)

[CarlosCortizasCT]

Description

This is a temporary branch just to test the React Router migration in the Playground application so we can learn how the process should look like when we want to do this in the MC applications.

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Latest commit: 8c4e80f

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Name	Status	Preview	Comments	Updated (UTC)
mc-app-kit-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 5, 2025 7:47am
merchant-center-application-kit-components-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 5, 2025 7:47am

[CarlosCortizasCT]

[preview_deployment]

[github-actions]

Release workflow succeeded ✅\nSee details: Workflow Run

[CarlosCortizasCT]

[preview_deployment]

[github-actions]

Release workflow succeeded ✅\nSee details: Workflow Run

[CarlosCortizasCT]

[preview_deployment]

[github-actions]

Release workflow succeeded ✅\nSee details: Workflow Run