Fixes
- Fix setup and options forms failing to load because the Deco interval validator could not be serialized, as reported on Home Assistant 2026.3.3.
- Preserve interval 0 and all intervals of at least 10 seconds; show a clear error for values 1-9.
- Existing valid configurations and polling behavior remain unchanged.
- Add form serialization/validation regression coverage and a dedicated HA 2026.3.3 CI job.
Thanks
Thanks to @arozwalak (Artur Rozwalak) for the detailed report and reproduction information in #668.