Fix Astro prerender build failure in GitHub Actions “Build” job

[Copilot]

The Build workflow was failing during bun run build in Astro prerender/static path generation. This PR applies a targeted fix to the failing prerender path logic so CI can complete successfully for the same code path exercised in Actions.

• Root cause

  • Corrected the prerender/static-path code path that was throwing during Astro’s build-time route generation.

• Code changes

  • Tightened route parameter/static-path handling to avoid invalid values reaching Astro prerender internals.
  • Kept the change scoped to the failing build path only, with no broader behavior changes.

• Example (shape of the fix)

// before: could emit undefined/invalid params during prerender
return items.map((item) => ({
  params: { slug: item.slug },
}));

// after: only emit valid prerender params
return items
  .filter((item) => typeof item.slug === "string" && item.slug.length > 0)
  .map((item) => ({
    params: { slug: item.slug },
  }));

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