1.4.14 — Fix entities stuck unavailable on slow devices

A device the config flow could reach (15s) would add successfully but then show all entities unavailable, because the coordinator capped each poll at 10s — undercutting the 15s timeout. The poll guard is now 20s, so polling is as patient as setup and entities populate on slow/memory-pressured devices. If entities still flap, the device is under heavy load (lighten the HA dashboard).