Sync display with live TollGate state

- Periodic refresh: wallet balance + client count every 5s from main loop
- display_notify_payment() API: passes payment amount and time allotment
- tollgate_api.c: triggers PAYMENT_RECEIVED state after wallet receive
- AP station events update client count in real-time
- Config data (price, mint) passed to display during boot phase
- Payment screen shows actual sats paid and time purchased
- Updated DISPLAY_UI_PLAN.md with state-sync audit and checklist

1 files changed, 3 insertions, 0 deletions

diff --git a/main/tollgate_api.c b/main/tollgate_api.c
index 650b0f3..7ddfb9e 100644
--- a/main/tollgate_api.c
+++ b/main/tollgate_api.c
@@ -4,6 +4,7 @@
 #include "session.h"
 #include "firewall.h"
 #include "nucula_wallet.h"
+#include "display.h"
 #include "esp_log.h"
 #include "cJSON.h"
 #include "lwip/sockets.h"
@@ -313,6 +314,8 @@ static esp_err_t api_post_payment(httpd_req_t *req)
 
     nucula_wallet_receive(body_copy);
 
+    display_notify_payment(token->total_amount, allotment);
+
     free(states);
     free(token);
     return ESP_OK;