changing layout sizes

lib/ai/formula_screen.dart

@@ -388,10 +388,10 @@ class _FormulaScreenState extends State<FormulaScreen> {
         children: [
           // Fixed width for field name
           SizedBox(
-            width: 150,
+            width: 50,
             child: Text(
               variable.name,
-              overflow: TextOverflow.ellipsis,
+              overflow: TextOverflow.fade
             ),
           ),
           const SizedBox(width: 8), // Add some spacing

lib/ai/import_preview_screen.dart

@@ -87,7 +87,7 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
     }
 
     try {
-      widget.corpus.loadFormulaElements(selectedElements);
+      widget.corpus.loadFormulaElements(selectedElements, true);
       
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(

lib/ai/unit_dropdown.dart

@@ -22,7 +22,7 @@ class UnitDropdown extends StatelessWidget {
     final availableUnits = unitNames.map((name) => corpus.getUnit(name)).toList();
 
     return SizedBox(
-      width: 200, // Constrain dropdown width
+      width: 50, // Constrain dropdown width
       child: DropdownButton<String>(
         value: selectedUnit ?? variable.unit,
       selectedItemBuilder: (context) => availableUnits.map((unit) =>

lib/corpus.dart

@@ -223,7 +223,7 @@ class Corpus{
 
   /// Loads formula elements, making sure to load units first, then formulas
   /// to avoid dependency issues.
-  void loadFormulaElements(List<FormulaElement> elements) {
+  void loadFormulaElements(List<FormulaElement> elements, [bool replaceOnDuplicates = false]) {
     List<UnitSpec> units = [];
     List<Formula> formulas = [];
 
@@ -239,10 +239,10 @@ class Corpus{
     }
 
     // Load units first to satisfy dependencies
-    loadUnits(units);
+    loadUnits(units, replaceOnDuplicates);
 
     // Then load formulas
-    loadFormulas(formulas);
+    loadFormulas(formulas, replaceOnDuplicates: replaceOnDuplicates, checkUnits: true);
   }
 
   /// Loads corpus from database elements