Implement textarea validation for character limits in submission service; enhance user feedback with error messages for minimum and maximum character requirements. Update translations and UI components to support new validation features.

packages/storybook/src/molecules/exercise-question/question-fixtures.ts

@@ -78,7 +78,9 @@ export const TEXTAREA_FIXTURE: QuestionStoryFixture = {
     title: 'Explain why exercise feedback should be specific. [TEXTAREA]',
     questionType: 'TEXTAREA',
     settings: {
-      description: 'Provide a detailed response.'
+      description: 'Provide a detailed response.',
+      minCharacters: 30,
+      maxCharacters: 250
     }
   },
   answer: '<p>Specific feedback helps students improve on the next attempt quickly.</p>'

packages/storybook/src/molecules/exercise-question/question-labels.ts

@@ -109,6 +109,10 @@ export const QUESTION_LABELS = {
   'hotspot.take.placeholder': 'Provide hotspot coordinates as JSON',
   'hotspot.preview.helper': 'Hotspot preview is provided by host app image and hotspot settings.',
   'textarea.edit.placeholder': 'Learners will answer with long-form text',
+  'textarea.edit.min_characters_label': 'Minimum characters',
+  'textarea.edit.min_characters_placeholder': 'Minimum characters',
+  'textarea.edit.max_characters_label': 'Maximum characters',
+  'textarea.edit.max_characters_placeholder': 'Maximum characters',
   'textarea.take.placeholder': 'Write your answer',
   'submission.common.no_answer': 'No answer',
   'submission.common.other': 'Other',