fix(customers): drop fake before-state in history diff rows

DiffRow rendered onboarding's initial field values as '— → value',
implying a prior state that never existed. Show the value alone when
there is no real before.

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

apps/edr-freight-web/backoffice/src/components/customers/ChangeRequestReview.tsx

@@ -174,6 +174,10 @@ export function DiffRow({
   from: string;
   to: string;
 }) {
+  // No real "before" (field went from unset straight to a value, e.g. the
+  // onboarding wizard's first save) — show the value alone rather than a
+  // fake "— → value" that implies a prior state that never existed.
+  const hadBefore = from !== "—";
   const changed = from !== to;
   return (
     <Stack gap={2}>
@@ -181,24 +185,24 @@ export function DiffRow({
         {label}
       </Text>
       <Group gap={8} wrap="nowrap" align="center">
-        <Text
+        {hadBefore && (
-          size="sm"
+          <Text
-          c="dimmed"
+            size="sm"
-          td={changed ? "line-through" : undefined}
+            c="dimmed"
-          style={{ wordBreak: "break-word" }}
+            td={changed ? "line-through" : undefined}
-        >
+            style={{ wordBreak: "break-word" }}
-          {from}
+          >
-        </Text>
+            {from}
-        {changed && (
+          </Text>
-          <>
-            <Text size="sm" c="edr-muted">
-              →
-            </Text>
-            <Text size="sm" fw={600} c="edr-text">
-              {to}
-            </Text>
-          </>
         )}
+        {hadBefore && changed && (
+          <Text size="sm" c="edr-muted">
+            →
+          </Text>
+        )}
+        <Text size="sm" fw={changed ? 600 : undefined} c={changed ? "edr-text" : "dimmed"}>
+          {to}
+        </Text>
       </Group>
     </Stack>
   );