Added a basic vehicle status UI showing mode and a few key datapoints.

scripts/vehicle_status_panel.gd

@@ -0,0 +1,83 @@
+@tool
+extends PanelContainer
+
+@export var mode_icon: Texture2D:
+	set(value):
+		mode_icon = value
+		if is_node_ready():
+			%ModeIcon.texture = value
+
+@export var stale_after_seconds := 2.0
+@export var pulse_alerts := true:
+	set(value):
+		pulse_alerts = value
+		if is_node_ready():
+			%StatusArt.pulse_alerts = value
+var _received_ms := -1
+var _severity := 0
+var _name := ""
+var _code := ""
+var _detail := ""
+var _action := ""
+var _stale := false
+
+func _ready() -> void:
+	%ModeIcon.texture = mode_icon
+	_refresh_status()
+	_refresh_references()
+
+## Severity and fault explanations come from vehicle telemetry, not gauge zones.
+func set_status(name_text: String, severity: int = 0, code: String = "", detail: String = "", action: String = "") -> void:
+	_name = name_text
+	_severity = clampi(severity, 0, 2)
+	_code = code
+	_detail = detail
+	_action = action
+	_refresh_status()
+
+func set_telemetry(voltage: float, current: float, power: float, internal_temperature: float) -> void:
+	for number in [voltage, current, power, internal_temperature]:
+		if not is_finite(number):
+			return
+	_refresh_references()
+	_received_ms = Time.get_ticks_msec()
+	var values := [voltage, current, power, internal_temperature]
+	var labels := [%VoltageValue, %CurrentValue, %PowerValue, %TemperatureValue]
+	var gauges := [%VoltageGauge, %CurrentGauge, %PowerGauge, %TemperatureGauge]
+	for index in range(4):
+		labels[index].text = (["%.1f V", "%.1f A", "%.0f W", "%.1f °C"][index]) % values[index]
+		gauges[index].value = values[index]
+		gauges[index].available = true
+		gauges[index].queue_redraw()
+	_refresh_status()
+
+func _process(_delta: float) -> void:
+	var stale := _received_ms >= 0 and Time.get_ticks_msec() - _received_ms > stale_after_seconds * 1000
+	if stale != _stale:
+		_refresh_status()
+
+func _refresh_status() -> void:
+	if not is_node_ready():
+		return
+	_stale = _received_ms >= 0 and Time.get_ticks_msec() - _received_ms > stale_after_seconds * 1000
+	var missing := _received_ms < 0
+	var unavailable := missing or _stale
+	%StatusArt.severity = 3 if unavailable else _severity
+	%StatusArt.pulse_alerts = pulse_alerts
+	%StatusArt.queue_redraw()
+	%ModeIcon.visible = not unavailable and _severity == 0
+	%Severity.text = "NO DATA" if missing else ("STALE" if _stale else ["", "WARNING", "FAULT"][_severity])
+	%StatusName.text = "Waiting for telemetry" if missing else (_name if not _name.is_empty() else "Mode unavailable")
+	%Code.text = _code
+	%Code.visible = not _code.is_empty() and not missing
+	%Detail.text = "" if missing else _detail
+	%Action.text = "Values held · connection overdue" if _stale else ("" if missing else _action)
+	var variant := ("VehicleWarningText" if _severity == 1 else "VehicleFaultText") if _severity in [1, 2] and not unavailable else "Label"
+	for label in [%Severity, %StatusName, %Code, %Detail, %Action]:
+		label.theme_type_variation = variant
+
+func _refresh_references() -> void:
+	%VoltageReference.text = "/ %.0f V" % %VoltageGauge.nominal
+	%CurrentReference.text = "/ %.0f A" % %CurrentGauge.fault_high
+	%PowerReference.text = "/ %.0f W" % %PowerGauge.fault_high
+	%TemperatureReference.text = "/ %.0f °C" % %TemperatureGauge.fault_high