feat(reports): clamp report descriptions with a show more toggle

Report descriptions run to a paragraph. ReportDescription wraps Mantine's
Spoiler to clamp them to two lines, and the toggle only renders when the
text actually overflows.

PageHeader kept its subtitle on a hard truncate class, which would have
pinned the spoiler to one line, so a ReactNode subtitle now renders as-is
and owns its own layout. A string subtitle still truncates as before.

apps/edr-freight-web/backoffice/src/components/page/PageHeader.tsx

@@ -58,9 +58,15 @@ export function PageHeader({
               {meta}
             </Group>
             {subtitle ? (
-              <Text c="dimmed" size="sm" mt={4} className="truncate">
-                {subtitle}
-              </Text>
+              typeof subtitle === "string" ? (
+                <Text c="dimmed" size="sm" mt={4} className="truncate">
+                  {subtitle}
+                </Text>
+              ) : (
+                // A component subtitle handles its own layout — truncating it
+                // to one line would defeat e.g. an expandable description.
+                <div style={{ marginTop: 4 }}>{subtitle}</div>
+              )
             ) : null}
           </div>
         </Group>