feat: add real-time ETA interpolation for block reader

station_broadcast.lua

@@ -2247,6 +2247,14 @@ function Main.loop()
         if Peripherals.blockReader then
             local ok, data = pcall(Peripherals.blockReader.getBlockData)
             if ok and data and data.TrainStops then
+                -- Real-time interpolation: calculate exact current tick even if NBT is cached
+                if not State.lastRefreshed or State.lastRefreshed ~= data.LastRefreshed then
+                    State.lastRefreshed = data.LastRefreshed
+                    State.lastRefreshedEpoch = now
+                end
+                local elapsedTicks = math.floor((now - (State.lastRefreshedEpoch or now)) / 50)
+                local currentTick = (data.LastRefreshed or 0) + elapsedTicks
+
                 for k, v in pairs(State.announcedApproaching) do
                     if now - v > 300000 then
                         State.announcedApproaching[k] = nil
@@ -2260,10 +2268,10 @@ function Main.loop()
                         local destination = st.Destination or "Unknown"
                         local platform = stop.StationInfo and stop.StationInfo.Platform or State.stationPlatform or "1"
                         
-                        -- Calculate ETA in seconds
+                        -- Calculate ETA in seconds using interpolated currentTick
                         local scheduledArrival = st.ScheduledArrival or 0
                         local realArrival = st.RealTimeArrival or 0
-                        local etaTicks = realArrival - (data.LastRefreshed or 0)
+                        local etaTicks = realArrival - currentTick
                         local etaSeconds = math.floor(etaTicks / 20)
                         
                         -- Calculate Delay in minutes