enhance contract document rendering with detailed cargo information

- Updated ContractDocumentViewModelBuilder to include cargoTypeName, containerType, and cargoSummary in the schedule.
- Modified contract dynamic template tests to validate the new cargo fields.
- Enhanced contract renderer service tests to reflect changes in cargo data structure.
- Updated contract view model interface to include new cargo-related fields.
- Improved dynamic template rendering to display cargo type and container type.
- Refactored exchange settings controller and service to streamline error handling and feed status management.
- Introduced article HTML conversion functions to support Quill editor integration for structured article editing.
- Added tests for article HTML conversion to ensure correct round-trip processing of clauses and bullets.

apps/edr-freight-web/backoffice/src/pages/contract_templates/ContractTemplateEditorPage.tsx

@@ -109,6 +109,18 @@ const QUICK_PLACEHOLDERS: PlaceholderDef[] = [
     icon: CalendarRange,
     hint: "Year the contract is signed",
   },
+  {
+    token: "{{contractStartDate}}",
+    label: "Start date",
+    icon: CalendarClock,
+    hint: "Date the contract's validity begins",
+  },
+  {
+    token: "{{contractEndDate}}",
+    label: "End date",
+    icon: CalendarClock,
+    hint: "Date the contract's validity ends",
+  },
 ];
 
 const MORE_PLACEHOLDER_GROUPS: { label: string; items: PlaceholderDef[] }[] = [