feat(cat-voices): unify sections navigation (#1175)

* refactor: unify sections navigation

* chore: formatting

Author: damian-molinski

catalyst_voices/apps/voices/lib/pages/treasury/campaign_builder_panel.dart

@@ -0,0 +1,32 @@
+import 'package:catalyst_voices/pages/treasury/treasury_campaign_setup.dart';
+import 'package:catalyst_voices_view_models/catalyst_voices_view_models.dart';
+import 'package:flutter/material.dart';
+
+class TreasuryBody extends StatelessWidget {
+  final List<TreasurySection> sections;
+
+  const TreasuryBody({
+    super.key,
+    required this.sections,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.separated(
+      padding: const EdgeInsets.only(top: 10),
+      itemCount: sections.length,
+      itemBuilder: (context, index) {
+        final section = sections[index];
+
+        switch (section) {
+          case CampaignSetup():
+            return TreasuryCampaignSetup(
+              key: ValueKey('CampaignSetupSection[${section.id}]Key'),
+              data: section,
+            );
+        }
+      },
+      separatorBuilder: (context, index) => const SizedBox(height: 24),
+    );
+  }
+}