add timeline edit/delete

lib/components/pages/calculator_details.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:mileograph_flutter/components/calculator/route_summary_widget.dart';
+import 'package:mileograph_flutter/objects/objects.dart';
+
+class CalculatorDetailsPage extends StatelessWidget {
+  const CalculatorDetailsPage({
+    super.key,
+    required this.result,
+  });
+
+  final Object? result;
+
+  @override
+  Widget build(BuildContext context) {
+    final parsed = result is RouteResult ? result as RouteResult : null;
+    if (parsed == null) {
+      return Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            TextButton.icon(
+              onPressed: () => context.pop(),
+              icon: const Icon(Icons.arrow_back),
+              label: const Text('Back'),
+            ),
+            const SizedBox(height: 12),
+            const Text(
+              'No route details available.',
+            ),
+          ],
+        ),
+      );
+    }
+
+    return Padding(
+      padding: const EdgeInsets.all(16.0),
+      child: RouteDetailsView(
+        route: parsed.calculatedRoute,
+        costs: parsed.costs,
+        onBack: () => context.pop(),
+      ),
+    );
+  }
+}
+