fix(chat-custom-width): Correct slider tooltip unit to be %

- Fix the unit of the custom width slider tooltip to display percentages (%) instead of REM

Changes summary:
- Corrected the unit displayed in the custom width slider tooltip:
  - The tooltip now correctly displays percentages (%) instead of REM units, providing a clearer indication of the slider value.

src/js/app/components/renderSwitch.js

@@ -49,7 +49,9 @@ function renderSmallCardOption({
 	return `
     <div 
       class="card card--range ${isLocked ? 'is-locked' : ''}" 
-      data-gpth-err="${min}${unit} &hArr; ${max}${unit}"
+      data-gpth-err="${min}${inputPlaceholder === '100%' ? '%' : unit} &hArr; ${max}${
+		inputPlaceholder === '100%' ? '%' : unit
+	}"
     >
       <label 
         for="${sanitizedInputId}"