feat(photodiode): add lux control in sensor panel and property dialog

The SPICE emitter already reads properties.lux (default 500, 100 nA/lux)
but the UI had no way to set it — the static dialog rejected the "range"
control type and there was no entry in SENSOR_CONTROLS for the live panel.

- Add photodiode entry in SENSOR_CONTROLS (slider 0-1000 lux)
- Register a minimal PartSimulationRegistry handler that forwards slider
  values via emitPropertyChange so the netlist memo invalidates
- Switch the photodiode lux control from "range" to "number" so the
  static ComponentPropertyDialog renders an editable input

frontend/public/components-metadata.json

@@ -3762,7 +3762,7 @@
           "name": "lux",
           "type": "number",
           "defaultValue": 500,
-          "control": "range",
+          "control": "number",
           "min": 0,
           "max": 100000,
           "description": "Illumination in lux"

frontend/src/simulation/parts/SensorParts.ts

@@ -4,6 +4,7 @@
  * Implements:
  *  - tilt-switch
  *  - ntc-temperature-sensor
+ *  - photodiode
  *  - gas-sensor (MQ-series)
  *  - flame-sensor
  *  - heart-beat-sensor
@@ -99,6 +100,28 @@ PartSimulationRegistry.register('ntc-temperature-sensor', {
   },
 });
 
+// ─── Photodiode ──────────────────────────────────────────────────────────────
+
+/**
+ * Photodiode — 2-terminal passive, reverse-biased light sensor. The SPICE
+ * emitter (componentToSpice.ts) reads `properties.lux` and drives a current
+ * source (100 nA/lux). This handler wires the SensorControlPanel slider so
+ * moving it updates the store → netlist rebuild → re-solve.
+ */
+PartSimulationRegistry.register('photodiode', {
+  attachEvents: (_element, _simulator, _getArduinoPinHelper, componentId) => {
+    registerSensorUpdate(componentId, (values) => {
+      if ('lux' in values) {
+        emitPropertyChange(componentId, 'lux', values.lux);
+      }
+    });
+
+    return () => {
+      unregisterSensorUpdate(componentId);
+    };
+  },
+});
+
 // ─── Gas Sensor (MQ-series) ──────────────────────────────────────────────────
 
 /**

frontend/src/simulation/sensorControlConfig.ts

@@ -226,6 +226,24 @@ export const SENSOR_CONTROLS: Record<string, SensorControlDef> = {
     defaultValues: { lux: 500 },
   },
 
+  // ── Photodiode ────────────────────────────────────────────────────────────
+  photodiode: {
+    title: 'Photodiode',
+    controls: [
+      {
+        type: 'slider',
+        key: 'lux',
+        label: 'Illumination',
+        min: 0,
+        max: 1000,
+        step: 1,
+        unit: 'lux',
+        defaultValue: 500,
+      },
+    ],
+    defaultValues: { lux: 500 },
+  },
+
   // ── PIR Motion Sensor ─────────────────────────────────────────────────────
   'pir-motion-sensor': {
     title: 'PIR Motion Sensor',

scripts/component-overrides.json

@@ -1026,7 +1026,7 @@
           "name": "lux",
           "type": "number",
           "defaultValue": 500,
-          "control": "range",
+          "control": "number",
           "min": 0,
           "max": 100000,
           "description": "Illumination in lux"