Fix Docker web build failure caused by case-sensitive page import

[Copilot]

build-and-push failed in GitHub Actions because the website build referenced the Contributing page with mismatched path casing, which resolves on some local environments but fails on Linux CI. This PR aligns the import with the actual file path to restore deterministic CI builds.

• Root cause

  • website/src/App.tsx imported the Contributing page via a path that did not match filesystem casing in CI.

• Targeted change

  • Updated the Contributing import in website/src/App.tsx to an explicit, exact-case module path.

• Why this works

  • Ensures module resolution is consistent across case-sensitive and case-insensitive filesystems.

// before
import Contributing from "./pages/Contributing";

// after
import Contributing from "./pages/Contributing.tsx";