Fixed other two components

src/lib/components/wizard/StepColumnMap.svelte

@@ -695,13 +695,23 @@
     {/if}
 
     <!-- Navigation -->
-    <div class="flex justify-end">
+    <!-- Navigation -->
+    <div class="flex justify-between">
+      <button
+        onclick={() => currentStep.set(2)}
+        class="px-4 py-2 bg-gray-200 text-gray-700 rounded-lg font-medium hover:bg-gray-300"
+      >
+        ← Back to Sheet Selection
+      </button>
+      
       <button
         onclick={handleContinue}
         disabled={!mappingComplete}
         class="px-4 py-2 bg-blue-600 text-white rounded-lg font-medium hover:bg-blue-700 disabled:bg-gray-400 disabled:cursor-not-allowed"
       >
-        {mappingComplete ? 'Continue →' : 'Complete mapping to continue'}
+        {mappingComplete
+          ? 'Continue →' 
+          : 'Select a column mapping'}
       </button>
     </div>
   </div>