Every row, every time, dashes included

The information card drew a row only when it had a value, so two chargers
side by side had two different shapes and neither could be read against the
other — and a field the service is silent about looked the same as a field
the card never offers. Every row is drawn now, with a dash where there is
nothing to say, which is itself worth seeing.

Service id loses the rule that hid it when it matched the serial. Kept, it
would have printed a dash for a charger that does have one, and a dash that
means "no" where the answer is "the same as above" is worse than the
repetition.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Web App/web/src/views/Charging.vue

@@ -229,10 +229,11 @@ function homeChargerSubtitle(c) {
   return [c.serial, c.model, c.siteName].filter(Boolean).join(" · ");
 }
 
-// Everything the record holds about one charger, as label/value rows. A field
-// the service never sent is left out rather than shown as a dash: the point of
-// the card is what is known. The provider's own id for the charger is the serial
-// for both services we speak to, so it appears only when it is something else.
+// Everything the card can say about one charger, as label/value rows. Every row
+// is drawn every time, a field nothing supplied included: which fields a charger
+// has an answer for is itself worth seeing, and a row that comes and goes with
+// the data makes two chargers side by side impossible to read against each
+// other. Nothing to say is said with a dash.
 function chargerInfoRows(c) {
   const live = liveFor(c) || {};
   const rows = [
@@ -250,12 +251,14 @@ function chargerInfoRows(c) {
     // on it here would be inventing it.
     ["chargePower", live.power],
     ["ocpp", ocppStatusLabel(live)],
-    ["providerId", c.providerChargerId === c.serial ? "" : c.providerChargerId],
+    ["providerId", c.providerChargerId],
     ["added", c.created ? formatDateTime(c.created) : ""],
   ];
-  return rows
-    .filter(([, value]) => value !== "" && value != null)
-    .map(([key, value]) => ({ key, label: t(`charging.info.${key}`), value }));
+  return rows.map(([key, value]) => ({
+    key,
+    label: t(`charging.info.${key}`),
+    value: value === "" || value == null ? "—" : value,
+  }));
 }
 
 async function refreshCtl() {