[Wasm Compatibility] Migrate from dart:js to dart:js_interop

[ArtemRedchych]

---

✅ Proposal

To support the future of Flutter Web and enable usage in Wasm builds, aad_oauth (and its transitive dependencies) should:

• Avoid dart:js and dart:js_util
• Migrate to the modern and Wasm-compatible dart:js_interop library
• Optionally use conditional imports to avoid secure storage entirely on platforms where it's unavailable (e.g., Wasm)

---

🙏 Request

Would you be open to migrating away from dart:js to dart:js_interop to ensure aad_oauth works in future-ready Flutter Web apps?

Thanks again!
— Artem

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. If you still think this issue is needed, reopen it again.