fix: GitHub Pages deploy fails — out directory missing after next build

[Copilot]

The "Deploy React App to GitHub Pages" workflow was failing at the export step because next build without output: 'export' produces .next/, not out/, which scripts/export.js requires.

Changes

• next.config.js — Add output: 'export' to the GitHub Pages production config block so next build emits out/

...(isProd && isGitHubPages && {
  output: 'export',
  basePath: '/Reminders',
  assetPrefix: '/Reminders/',
  images: { unoptimized: true }
}),

• /reminder/[id]/page.tsx — Next.js 15 throws if a dynamic route returns an empty generateStaticParams with output: 'export'. Return a placeholder path and set dynamicParams = false so unknown IDs fall through to the SPA 404 fallback (public/404.html) for client-side routing.

export const dynamicParams = false;

export function generateStaticParams() {
  // Next.js 15 requires at least one path for dynamic routes with `output: 'export'`.
  // Real IDs are loaded client-side; unknown paths are handled via the SPA 404 fallback.
  return [{ id: 'placeholder' }];
}

Original prompt

Reference: https://github.com/KaueReinbold/Reminders/actions/runs/22305278362/job/64522807367

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