Upgrade Next.js scaffold to v15.5.9

[ymekuria]

Summary

• Upgrade Next.js from 14.2.12 to 15.5.7
• Add --no-turbopack flag to create-next-app
• Update next.config to TypeScript format (next.config.ts)
• Add turbopack resolveAlias for o1js (for future turbopack compatibility)
• Add webpack resolve.fallback for Node.js modules (fs, crypto, path, stream)
• Update tsconfig moduleResolution to "bundler" for Next.js 15
• Update tests for Next.js 15 scaffold

Refactoring

• Extract Next.js config template to src/lib/ui/next/nextConfig.js
• Extract Next.js tsconfig template to src/lib/ui/next/tsConfig.js
• Extract Svelte tsconfig template to src/lib/ui/svelte/tsConfig.js

Test plan

• Run zk project test --ui next and verify scaffold completes
• Run npm run dev in the ui folder and verify page loads
• Run npm run build and verify production build succeeds
• All unit tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ac9347a) to head (f420f78).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #752   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines         1492      1487    -5     
  Branches       304       304           
=========================================
- Hits          1492      1487    -5     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.