Fix validation system - make it more permissive

- Disable strict semantic validation that was failing on:
  - Inference questions (smiled → happy)
  - Vocabulary questions (extinguish → put out fire)
  - Main idea questions (recycling → environmental protection)
  - Non-Latin scripts (Chinese, Arabic, etc.)
- Keep basic structural validation (length, format)
- Add warning logs instead of failing validation
- Rely on user feedback system for quality control

The previous validation was too literal and language-biased,
rejecting valid questions that required inference or used synonyms.

Author: rgilks

app/lib/ai/question-validator.ts

@@ -177,37 +177,35 @@ export const validateQuestionQuality = (
     return { isValid: false, reason: 'One or more options are too short.', metrics };
   }
 
-  // Enhanced validation checks
+  // Enhanced validation checks (made more permissive due to language/type limitations)
+  // Only fail on the most basic structural issues
+
   if (!metrics.answerConsistency) {
-    return {
-      isValid: false,
-      reason: 'Correct answer is not supported by the relevant text.',
-      metrics,
-    };
+    console.warn(
+      '[Validation] Answer consistency check failed, but allowing due to language/type limitations'
+    );
+    // Don't fail - just log the warning
   }
 
   if (!metrics.explanationConsistency) {
-    return {
-      isValid: false,
-      reason: 'Correct explanation does not match the correct answer.',
-      metrics,
-    };
+    console.warn(
+      '[Validation] Explanation consistency check failed, but allowing due to language/type limitations'
+    );
+    // Don't fail - just log the warning
   }
 
   if (!metrics.questionAnswerCoherence) {
-    return {
-      isValid: false,
-      reason: 'Question cannot be answered from the provided passage.',
-      metrics,
-    };
+    console.warn(
+      '[Validation] Question-answer coherence check failed, but allowing due to language/type limitations'
+    );
+    // Don't fail - just log the warning
   }
 
   if (!metrics.semanticAnswerValidation) {
-    return {
-      isValid: false,
-      reason: 'Correct answer is not semantically supported by the passage.',
-      metrics,
-    };
+    console.warn(
+      '[Validation] Semantic answer validation failed, but allowing due to language/type limitations'
+    );
+    // Don't fail - just log the warning
   }
 
   // Add more sophisticated checks based on CEFR level if needed