[eng-3646] migrate off Vercel (Next.js → Vite)

[dnehl]

Migrate the standalone Fireblocks dApp from Next.js/Vercel to a Vite SPA
deployed on AWS Amplify, mirroring the admin-dashboard setup.

• Replace Next.js with Vite + @vitejs/plugin-react and the Vanilla Extract Vite plugin; add index.html + src/main.tsx entry point
• Merge layout.tsx/page.tsx into src/app/app.tsx; move layoutContainer off and set html/body/#app height in global styles
• Drop next/dynamic (direct re-exports), swap next/image for , remove "use client" directives, and use static asset URLs (firebaseLogo, icon.png moved to public/)
• Switch env access to import.meta.env.VITE_API_KEY (+ vite-env.d.ts)
• Add mise.toml + mise.lock (node 24.15.0, pnpm 10.33.2) and regenerate the pnpm lockfile; set tsconfig moduleResolution to bundler
• Update biome ignores (.next → dist) and pin schema to 2.3.11
• Add amplify.yml and .github/workflows/ci.yml (mise + lint + build)

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	vite@​8.1.0
	@​vitejs/​plugin-react@​6.0.3
	@​vanilla-extract/​vite-plugin@​5.2.3

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm @emnapi/runtime is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: pnpm-lock.yaml → npm/vite@8.1.0 → npm/@emnapi/runtime@1.11.1 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/@emnapi/runtime@1.11.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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