Fix slow OBD value load on dashboard (BUG-19)

modules/app_obd.py

@@ -271,9 +271,51 @@ def get_fresh_speed(max_age=5):
     return speed
 
 
+def emit_current_state():
+    """Push the current OBD values to a newly connected dashboard.
+
+    The polling threads only emit on their next tick, so a freshly loaded
+    page would otherwise sit on "—" until then. Emitting a snapshot here makes
+    the cards fill immediately on connect/reconnect instead of waiting for the
+    next poll cycle (or a reconnect/probe round-trip).
+    """
+    connected = _is_car_connected()
+    app_events.socketio.emit(
+        "obd_status", obd_status[1] if connected else obd_status[0]
+    )
+    if connected:
+        app_events.socketio.emit("obd_speed", get_speedtime())
+        app_events.socketio.emit("obd_rpm", rpm if rpm is not None else "-")
+        app_events.socketio.emit(
+            "obd_coolant_temp",
+            coolant_temp if coolant_temp is not None else "-",
+        )
+        app_events.socketio.emit(
+            "obd_fuel_level",
+            fuel_level if fuel_level is not None else "-",
+        )
+        app_events.socketio.emit(
+            "obd_throttle",
+            throttle_position if throttle_position is not None else "-",
+        )
+        if mil_on is not None:
+            app_events.socketio.emit(
+                "obd_mil", {"on": mil_on, "dtc_count": len(dtc_codes)}
+            )
+        if dtc_codes:
+            app_events.socketio.emit("obd_dtc", dtc_codes)
+    else:
+        app_events.socketio.emit("obd_speed", "-")
+        app_events.socketio.emit("obd_rpm", "-")
+        app_events.socketio.emit("obd_coolant_temp", "-")
+        app_events.socketio.emit("obd_fuel_level", "-")
+        app_events.socketio.emit("obd_throttle", "-")
+
+
 def obd_connection():
     """Emit current state for a newly connected browser and ensure OBD is running."""
     start_obd()
+    emit_current_state()
 
 
 def _persist_car_connected():