Implement pump flow monitoring and UI normalization enhancements

- Rust: Add `MIN_PUMP_FLOW_ML` constant and logging for insufficient pump flow with fault handling.
- UI: Normalize config fields to maintain consistency and prevent false dirty flags after round-trips.
- KiCad: Update board zone settings for `PlantCtrlESP32` and `MPPT`.
- IntelliJ: Add `.idea` configurations for project setup and inspections.

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

@@ -36,10 +36,10 @@ export interface BackupHeader {
 
 export interface NetworkConfig {
     ap_ssid: string,
-    ssid: string,
-    password: string,
-    mqtt_url: string,
-    base_topic: string,
+    ssid: string | null,
+    password: string | null,
+    mqtt_url: string | null,
+    base_topic: string | null,
     mqtt_user: string | null,
     mqtt_password: string | null,
     max_wait: number

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

@@ -246,8 +246,11 @@ export class Controller {
         const response = await fetch(PUBLIC_URL + "/get_config");
         const loaded = await response.json();
         const currentConfig = loaded as PlantControllerConfig;
-        controller.setInitialConfig(currentConfig);
         controller.setConfig(currentConfig);
+        // Store the config after the UI round-trip so null fields that the UI
+        // normalises (e.g. null → "" → null, null timezone → "UTC") are
+        // represented consistently and don't trigger a false dirty flag.
+        controller.setInitialConfig(controller.getConfig());
         //sync json view initially
         controller.configChanged();
         controller.progressview.removeProgress("get_config");

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

@@ -102,25 +102,25 @@ export class NetworkConfigView {
 
     setConfig(network: NetworkConfig) {
       this.ap_ssid.value = network.ap_ssid;
-      this.ssid.value = network.ssid;
-      this.password.value = network.password;
-      this.mqtt_url.value = network.mqtt_url;
-      this.base_topic.value = network.base_topic;
+      this.ssid.value = network.ssid ?? "";
+      this.password.value = network.password ?? "";
+      this.mqtt_url.value = network.mqtt_url ?? "";
+      this.base_topic.value = network.base_topic ?? "";
       this.mqtt_user.value = network.mqtt_user ?? "";
       this.mqtt_password.value = network.mqtt_password ?? "";
       this.max_wait.value = network.max_wait.toString();
     }
-    
+
     getConfig(): NetworkConfig {
       return {
         max_wait: +this.max_wait.value,
         ap_ssid: this.ap_ssid.value,
-        ssid: this.ssid.value ?? null,
-        password: this.password.value ?? null,
-        mqtt_url: this.mqtt_url.value ?? null,
-        mqtt_user: this.mqtt_user.value ? this.mqtt_user.value : null,
-        mqtt_password: this.mqtt_password.value ? this.mqtt_password.value : null,
-        base_topic: this.base_topic.value ?? null
+        ssid: this.ssid.value || null,
+        password: this.password.value || null,
+        mqtt_url: this.mqtt_url.value || null,
+        mqtt_user: this.mqtt_user.value || null,
+        mqtt_password: this.mqtt_password.value || null,
+        base_topic: this.base_topic.value || null
       }
     }
   }