refactor(gradebook): restructure external assessment management + import UI

- unify manage and configure-weights into a GradebookSettingsDialog
- decompose import wizard into ColumnMappingTable + useImportMapping hook
- extract importValidation module with dedicated unit tests
- rework ExternalAssessmentImportService header/identifier handling
- refresh en/ko/zh locales for the new settings surface

Author: LWS49

app/controllers/course/external_assessment_imports_controller.rb

@@ -26,28 +26,23 @@ def component
 
   def build_service
     permitted_params = import_params
-    weighted_view_enabled = gradebook_settings.weighted_view_enabled
     Service.new(
       course: current_course,
       actor: current_user,
-      components: permitted_params[:components].map do |c|
-        { name: c[:name],
-          weightage: weighted_view_enabled ? c[:weightage].to_i : 0,
-          maximum_grade: c[:maximumGrade].to_f }
-      end,
       identifier_mode: permitted_params[:identifierMode],
-      csv_data: permitted_params[:csvData]
+      identifier_column: permitted_params[:identifierColumn],
+      csv_data: permitted_params[:csvData],
+      mappings: (permitted_params[:mappings] || []).map do |m|
+        { header: m[:header], action: m[:action], target: m[:target],
+          max_grade: m[:maxGrade].presence&.to_f, weight: m[:weight].presence&.to_f }
+      end
     )
   end
 
-  def gradebook_settings
-    @gradebook_settings ||= Course::Settings::GradebookComponent.new(component)
-  end
-
   def import_params
-    @import_params ||= params.slice(:identifierMode, :csvData, :onConflict, :components).permit(
-      :identifierMode, :csvData, :onConflict,
-      components: [:name, :weightage, :maximumGrade]
+    @import_params ||= params.permit(
+      :identifierMode, :identifierColumn, :csvData, :onConflict,
+      mappings: [:header, :action, :target, :maxGrade, :weight]
     )
   end
 end

app/controllers/course/gradebook_controller.rb

@@ -54,7 +54,10 @@ def persist_weight_updates(updates)
   def persist_cap_total
     return unless params.key?(:capTotal)
 
-    @settings.cap_weighted_total = params[:capTotal]
+    new_value = ActiveRecord::Type::Boolean.new.cast(params[:capTotal])
+    return if @settings.cap_weighted_total == new_value
+
+    @settings.cap_weighted_total = new_value
     current_course.save!
   end