Update PAN Validation.js

Improves PAN validation by showing errors only for invalid input, reducing distractions and unnecessary messages.
Also used newValue to take input as it is a onChange Script

Author: rashmi269

Client-Side Components/Catalog Client Script/PAN Validation/PAN Validation.js

@@ -1,13 +1,15 @@
 function onChange(control, oldValue, newValue, isLoading, isTemplate) {
     if (isLoading || newValue === '') {
+        // Clear any previous message if the field is empty
+        g_form.hideFieldMsg('pan_number');
         return;
     }
-    var panNumber = g_form.getValue("pan_number"); //Get the PAN card information
-    var panRegex = /^[A-Z]{5}[0-9]{4}[A-Z]{1}$/; // Regex for the PAN Card
 
-    if (panRegex.test(panNumber)) {
-        g_form.showFieldMsg("pan_number", "Valid PAN card number.", true); //Valid PAN card enterd populates this message 
-    } else {
-        g_form.showErrorBox("pan_number", "InValid PAN card number.", true); //In Valid PAN card details enterd populate this message 
+    var panNumber = newValue.toUpperCase(); // Convert input to uppercase for consistency
+    var panRegex = /^[A-Z]{5}[0-9]{4}[A-Z]{1}$/;
+
+    if (!panRegex.test(panNumber)) {
+        g_form.showFieldMsg('pan_number', 'Invalid PAN card number.', 'error');
     }
+    // No "Valid" message displayed to reduce distraction
 }