feat: Support bigger font size in dashboard (#10974)

# Pull Request Template

## Description

Fixes
https://linear.app/chatwoot/issue/CW-4091/accessibility-improvement-support-bigger-font-size-for-the-dashboard

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### **Loom video**

https://www.loom.com/share/1ab781859fa748a5ad54aacbacd127b4?sid=a7dd9164-a6de-462f-bff7-1b25e9c55b4f

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/components-next/Campaigns/CampaignLayout.vue

@@ -22,7 +22,7 @@ const handleButtonClick = () => {
 <template>
   <section class="flex flex-col w-full h-full overflow-hidden bg-n-background">
     <header class="sticky top-0 z-10 px-6 lg:px-0">
-      <div class="w-full max-w-[960px] mx-auto">
+      <div class="w-full max-w-[60rem] mx-auto">
         <div class="flex items-center justify-between w-full h-20 gap-2">
           <span class="text-xl font-medium text-n-slate-12">
             {{ headerTitle }}
@@ -44,7 +44,7 @@ const handleButtonClick = () => {
       </div>
     </header>
     <main class="flex-1 px-6 overflow-y-auto lg:px-0">
-      <div class="w-full max-w-[960px] mx-auto py-4">
+      <div class="w-full max-w-[60rem] mx-auto py-4">
         <slot name="default" />
       </div>
     </main>