fix(routes): prevent synthetic event recycling issue in name input handler

apps/edr-freight-web/backoffice/src/pages/fleet/RoutesPage.tsx

@@ -408,7 +408,13 @@ export default function RoutesPage() {
             <TextInput
               label="Name"
               value={form.name}
-              onChange={(e) => setForm((current) => ({ ...current, name: e.currentTarget.value }))}
+              onChange={(e) => {
+                // Capture the value before the state updater runs — React may
+                // recycle the synthetic event, nulling currentTarget by the time
+                // the updater executes ("Cannot read properties of null").
+                const name = e.currentTarget.value;
+                setForm((current) => ({ ...current, name }));
+              }}
             />
             <Group justify="space-between">
               <Text size="sm" fw={500}>