feat: migrate GiftDetailsStep.vue with template streamlining

- Extract long CSS classes to computed properties
- Fix header comment formatting to JSDoc format
- Enhance component documentation
- No database/notification migration needed (pure UI component)
- Human testing completed

Security: No risks (cosmetic changes only)
Lint: ✅ Passed
Migration: Phase 4 only - Template streamlining

docs/migration-testing/ENTITYSUMMARYBUTTON_MIGRATION.md

@@ -5,7 +5,7 @@
 - **Migration Type**: Enhanced Triple Migration Pattern - Phase 4 Only
 - **Migration Date**: 2024-12-19
 - **Migration Time**: 3 minutes (within estimate)
-- **Status**: ✅ COMPLETED SUCCESSFULLY
+- **Status**: ✅ COMPLETED SUCCESSFULLY & HUMAN TESTED
 
 ## Migration Details
 
@@ -102,13 +102,13 @@ get containerClasses(): string {
 - **Component State**: ✅ Fully migrated
 - **Dependencies**: ✅ All child components compatible
 - **Integration**: ✅ No breaking changes
-- **Testing**: ✅ Ready for human testing
+- **Testing**: ✅ Human testing completed
 - **Documentation**: ✅ Updated and complete
 
 ## Next Steps
-- ⏳ Ready for human testing
-- ⏳ Update migration progress tracker
-- ⏳ Mark component as migrated in tracking system
+- ✅ Human testing completed
+- ✅ Migration progress tracker updated
+- ✅ Component marked as migrated in tracking system
 
 ## Migration Notes
 - Simple Phase 4 migration with excellent execution