M8-T18: add source and multi-commodity meter UI

frontend/src/energy/DsmrPanel.tsx

@@ -47,7 +47,7 @@ export function DsmrPanel() {
     <Stack gap="md" data-testid="dsmr-panel">
       <Group justify="space-between" align="center">
         <div>
-          <Text fw={600}>Latest DSMR reading</Text>
+          <Text fw={600}>Latest DSMR reading (compatibility view)</Text>
           <Text size="xs" c="dimmed">
             The most recent parsed telegram persisted to <code>dsmr_reading</code>.
           </Text>
@@ -100,9 +100,9 @@ function DsmrContent({ isLoading, isError, data }: DsmrContentProps) {
   if (!data.found || !data.payload) {
     return (
       <Alert color="gray" data-testid="dsmr-empty">
-        No DSMR data yet. Enable <strong>DSMR ingest</strong> in Config, make sure MQTT
-        is connected, and confirm the DSMR Reader is publishing to the configured topic
-        (default <code>dsmr/json</code>). Rows are stored about once every 10 seconds.
+        No DSMR data yet. In this DSMR Source, enable or edit the broker, topic, and profile
+        configuration, then confirm the publisher is sending to the configured topic (default
+        <code>dsmr/json</code>). Rows are stored about once every 10 seconds.
       </Alert>
     )
   }