Previously the softAP was torn down (esp_restart) only 1s after sending
the success page, while the page's own redirect timer waited 7s -- so
the AP (and the phone's captive-portal session with it) was gone long
before the redirect could fire. Now the page shows a live 10s countdown
before redirecting, and the device holds the AP up for 11s so the
countdown always completes. Also added a "Redirect now" button for a
phone that's already reconnected to normal WiFi.
tfaour
462b558bef