Add imageSize and imageAlignment to SourceText schema

models/SourceText.js

@@ -28,6 +28,9 @@ const sourceTextSchema = new mongoose.Schema({
   translationBrief: { type: String },
   imageUrl: { type: String },
   imageAlt: { type: String },
+  // Image-only configuration
+  imageSize: { type: Number, default: 200 },
+  imageAlignment: { type: String, enum: ['left', 'center', 'right'], default: 'center' },
   culturalElements: [culturalElementSchema],
   difficulty: { 
     type: String,