WEB-95 Modernize codebase

[wlenig]

• WEB-96 Upgrade to Next.js 16 / React 19 — rename middleware.ts → proxy.ts, convert configs to TS/ESM, default to Turbopack
• WEB-75 Upgrade to Prisma v7 — new prisma-client generator, prisma.config.ts, @prisma/adapter-pg, ESM/bundler module resolution, postinstall generate script
• WEB-74 Replace React.FC with plain function declarations; remove unused React imports
• WEB-76 Bump @types/node, Tailwind, and remaining deps to latest compatible versions
• WEB-71 Convert next.config.js, postcss.config.js, .eslintrc.js to ESM/TS; delete redundant tailwind.config.js
• WEB-72 Extract hardcoded colors in Navigation/HeaderContent configs into CSS custom properties (var(--color-*))
• WEB-69 Remove redundant .text-sga-red/.bg-sga-red overrides from styles.css (covered by Tailwind v4 @theme)

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Project	Deployment	Actions	Updated (UTC)
website-development	Ready	Preview, Comment	Mar 20, 2026 0:17am

[wlenig]

WEB-98

• Separated concerns: user-facing error display no longer lives in the action helper function
• Replaced custom useRunAction hook with useTransition and a simpler runAction function
  • The old hook manually reimplemented useTransition's behavior, essentially