Add Tasmota timezone handling and dashboard updates

internal/config/config_test.go

@@ -7,8 +7,6 @@ import (
 )
 
 func TestLoadNormalizesDeviceAliases(t *testing.T) {
-	t.Setenv("MQTT_SCRUBBER_DEVICE_ALIASES", "")
-
 	configPath := filepath.Join(t.TempDir(), "config.json")
 	contents := `{
 	  "mqtt": {
@@ -105,3 +103,76 @@ func TestLoadOverridesDeviceAliasesFromEnv(t *testing.T) {
 		t.Fatalf("unexpected desk alias: got %q", got)
 	}
 }
+
+func TestLoadSupportsTasmotaTimeZone(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.json")
+	contents := `{
+	  "mqtt": {
+	    "broker": "tcp://127.0.0.1:1883",
+	    "client_id": "mqqt-scrubber",
+	    "topics": ["tele/+/STATE"],
+	    "qos": 0
+	  },
+	  "influx": {
+	    "url": "http://127.0.0.1:8181",
+	    "database": "home",
+	    "precision": "ns"
+	  },
+	  "app": {
+	    "batch_size": 200,
+	    "buffer_size": 1000,
+	    "flush_interval": "10s",
+	    "flush_timeout": "10s",
+	    "log_level": "info",
+	    "health_address": ":8080",
+	    "tasmota_time_zone": "Europe/Prague"
+	  }
+	}`
+
+	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
+		t.Fatalf("write config file: %v", err)
+	}
+
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Load returned error: %v", err)
+	}
+
+	if got := cfg.App.TasmotaLocation().String(); got != "Europe/Prague" {
+		t.Fatalf("unexpected tasmota timezone: got %q", got)
+	}
+}
+
+func TestLoadRejectsInvalidTasmotaTimeZone(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.json")
+	contents := `{
+	  "mqtt": {
+	    "broker": "tcp://127.0.0.1:1883",
+	    "client_id": "mqqt-scrubber",
+	    "topics": ["tele/+/STATE"],
+	    "qos": 0
+	  },
+	  "influx": {
+	    "url": "http://127.0.0.1:8181",
+	    "database": "home",
+	    "precision": "ns"
+	  },
+	  "app": {
+	    "batch_size": 200,
+	    "buffer_size": 1000,
+	    "flush_interval": "10s",
+	    "flush_timeout": "10s",
+	    "log_level": "info",
+	    "health_address": ":8080",
+	    "tasmota_time_zone": "Not/AZone"
+	  }
+	}`
+
+	if err := os.WriteFile(configPath, []byte(contents), 0o644); err != nil {
+		t.Fatalf("write config file: %v", err)
+	}
+
+	if _, err := Load(configPath); err == nil {
+		t.Fatal("expected Load to reject invalid tasmota_time_zone")
+	}
+}