Add firmware build timestamp support for sensors; update detection workflows and UI accordingly.

Software/MainBoard/rust/src_webpack/src/api.ts

@@ -199,9 +199,22 @@ export interface BatteryState {
     state_of_health: string
 }
 
-export interface DetectionPlant {
+/// Request: which sensors to send IDENTIFY_CMD to.
+export interface SensorRequest {
     sensor_a: boolean,
-    sensor_b: boolean
+    sensor_b: boolean,
+}
+
+export interface DetectionRequest {
+    plant: SensorRequest[]
+}
+
+/// Response: detection result per plant.
+/// sensor_a / sensor_b: firmware build timestamp in minutes since Unix epoch,
+/// or null if the sensor did not respond.
+export interface DetectionPlant {
+    sensor_a: number | null,
+    sensor_b: number | null,
 }
 
 export interface Detection {