Now uses some of the old EIP712 code as common code between the two implementations + approve/reject button now works

src_features/signMessageEIP712/ui_flow_712.c

@@ -1,6 +1,7 @@
 #include "ui_flow_712.h"
 #include "ui_logic.h"
 #include "shared_context.h" // strings
+#include "common_712.h"
 
 // clang-format off
 UX_STEP_NOCB(
@@ -30,7 +31,7 @@ UX_STEP_INIT(
 UX_STEP_CB(
     ux_712_step_approve,
     pb,
-    NULL,//io_seproxyhal_touch_signMessage712_ok(NULL),
+    ui_712_approve_cb(NULL),
     {
       &C_icon_validate_14,
       "Approve",
@@ -38,7 +39,7 @@ UX_STEP_CB(
 UX_STEP_CB(
     ux_712_step_reject,
     pb,
-    NULL,//io_seproxyhal_touch_signMessage712_cancel(NULL),
+    ui_712_reject_cb(NULL),
     {
       &C_icon_crossmark,
       "Reject",