feat: Hide installation identifier (#11722)

<img width="1779" alt="Screenshot 2025-06-12 at 7 21 59 PM"
src="https://github.com/user-attachments/assets/a4c54d7f-4f5f-4d72-a81b-be4d88066549"
/>




## Summary
- Hides installation identifier by default so that users don't
accidentally expose it in screenshots.

app/assets/javascripts/secretField.js

@@ -10,7 +10,8 @@ function toggleSecretField(e) {
   if (!textElement) return;
 
   if (textElement.dataset.secretMasked === 'false') {
-    textElement.textContent = '•'.repeat(10);
+    const maskedLength = secretField.dataset.secretText?.length || 10;
+    textElement.textContent = '•'.repeat(maskedLength);
     textElement.dataset.secretMasked = 'true';
     toggler.querySelector('svg use').setAttribute('xlink:href', '#eye-show');
 
@@ -32,3 +33,13 @@ function copySecretField(e) {
 
   navigator.clipboard.writeText(secretField.dataset.secretText);
 }
+
+document.addEventListener('DOMContentLoaded', () => {
+  document.querySelectorAll('.cell-data__secret-field').forEach(field => {
+    const span = field.querySelector('[data-secret-masked]');
+    if (span && span.dataset.secretMasked === 'true') {
+      const len = field.dataset.secretText?.length || 10;
+      span.textContent = '•'.repeat(len);
+    }
+  });
+});