example: update browser app to React Router 8

[Makyl]

Summary

This PR updates the browser example from React Router 6 to React Router 8 to resolve its dependency audit findings and align imports with the v8 package layout.

The browser example now audits with zero vulnerabilities while preserving its existing declarative routing behavior.

Changes

• Replace react-router-dom with react-router 8.3.0 in the browser example.
• Move BrowserRouter, route components, navigation components, and routing hooks to react-router imports.
• Refresh the browser lockfile with the React Router 8 dependency graph and audited Nano ID and PostCSS patch updates.

Risk / Impact

• No public Nexus SDK APIs or exports change.
• Browser routing behavior is unchanged; this only migrates the dependency and import source.
• The browser example now inherits React Router 8's Node 22.22+ requirement.
• The regenerated lockfile also includes audited Nano ID and PostCSS patch updates.

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Project	Deployment	Actions	Updated (UTC)
nexus-sdk	Ready	Preview, Comment	Jul 27, 2026 12:34pm