feat: add Voice Calls feature card to settings showcase (#14635)

## Linear Ticket 

https://linear.app/chatwoot/issue/CW-7250/add-voice-calls-to-self-hosted-super-admin-feature-list

## Description

Adds a **Voice Calls** card to the Super Admin → Settings → Features
showcase so self-hostedadmins can see at a glance whether voice calling
is available on the installation.

## Type of change

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

## Screenshots?

<img width="1512" height="843" alt="Screenshot 2026-06-03 at 3 15 22 PM"
src="https://github.com/user-attachments/assets/988db14b-fef1-4b72-a55e-c7a8884521dd"
/>


## Checklist:

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

app/helpers/super_admin/features.yml

@@ -34,6 +34,12 @@ disable_branding:
   enabled: <%= (ChatwootHub.pricing_plan != 'community') %>
   icon: 'icon-sailbot-fill'
   enterprise: true
+voice_calls:
+  name: 'Voice Calls'
+  description: 'Enable voice calling capabilities for your agents and customers.'
+  enabled: <%= (ChatwootHub.pricing_plan != 'community') %>
+  icon: 'icon-voice-line'
+  enterprise: true
 
 # ------- Product Features ------- #
 help_center:

app/views/super_admin/application/_icons.html.erb

@@ -128,6 +128,10 @@
     <path d="M18.3 10.2H19.2C19.4387 10.2 19.6676 10.2948 19.8364 10.4636C20.0052 10.6324 20.1 10.8613 20.1 11.1V20.1C20.1 20.3387 20.0052 20.5676 19.8364 20.7364C19.6676 20.9052 19.4387 21 19.2 21H4.80002C4.56133 21 4.33241 20.9052 4.16363 20.7364C3.99485 20.5676 3.90002 20.3387 3.90002 20.1V11.1C3.90002 10.8613 3.99485 10.6324 4.16363 10.4636C4.33241 10.2948 4.56133 10.2 4.80002 10.2H5.70002V9.3C5.70002 8.47267 5.86298 7.65345 6.17958 6.88909C6.49619 6.12474 6.96024 5.43024 7.54525 4.84523C8.13026 4.26022 8.82477 3.79616 9.58912 3.47956C10.3535 3.16295 11.1727 3 12 3C12.8274 3 13.6466 3.16295 14.4109 3.47956C15.1753 3.79616 15.8698 4.26022 16.4548 4.84523C17.0398 5.43024 17.5039 6.12474 17.8205 6.88909C18.1371 7.65345 18.3 8.47267 18.3 9.3V10.2ZM5.70002 12V19.2H18.3V12H5.70002ZM11.1 13.8H12.9V17.4H11.1V13.8ZM16.5 10.2V9.3C16.5 8.10653 16.0259 6.96193 15.182 6.11802C14.3381 5.27411 13.1935 4.8 12 4.8C10.8066 4.8 9.66196 5.27411 8.81804 6.11802C7.97413 6.96193 7.50002 8.10653 7.50002 9.3V10.2H16.5Z" fill="currentColor"/>
   </symbol>
 
+  <symbol id="icon-voice-line" viewBox="0 0 24 24">
+    <g fill="none" stroke="currentColor"><path d="M12.75 4.50031C14.5402 4.50031 16.2571 5.21146 17.523 6.47733C18.7888 7.7432 19.5 9.46009 19.5 11.2503" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/><path d="M12.75 7.5C13.7446 7.5 14.6984 7.89509 15.4017 8.59835C16.1049 9.30161 16.5 10.2554 16.5 11.25" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/><path d="M13.374 15.4263C13.5289 15.4974 13.7034 15.5137 13.8688 15.4724C14.0341 15.4311 14.1805 15.3347 14.2837 15.1991L14.55 14.8503C14.6897 14.664 14.8709 14.5128 15.0792 14.4087C15.2875 14.3045 15.5171 14.2503 15.75 14.2503H18C18.3978 14.2503 18.7794 14.4083 19.0607 14.6896C19.342 14.9709 19.5 15.3525 19.5 15.7503V18.0003C19.5 18.3981 19.342 18.7797 19.0607 19.061C18.7794 19.3423 18.3978 19.5003 18 19.5003C14.4196 19.5003 10.9858 18.078 8.45406 15.5462C5.92232 13.0145 4.5 9.58073 4.5 6.00031C4.5 5.60248 4.65804 5.22095 4.93934 4.93964C5.22064 4.65834 5.60218 4.50031 6 4.50031H8.25C8.64782 4.50031 9.02935 4.65834 9.31066 4.93964C9.59196 5.22095 9.75 5.60248 9.75 6.00031V8.2503C9.75 8.48317 9.69578 8.71284 9.59164 8.92113C9.4875 9.12941 9.33629 9.31058 9.15 9.45031L8.799 9.71355C8.66131 9.81869 8.56426 9.96824 8.52434 10.1368C8.48442 10.3054 8.50409 10.4826 8.58 10.6383C9.60501 12.7202 11.2908 14.4039 13.374 15.4263Z" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/></g>
+  </symbol>
+
   <symbol id="icon-captain" viewBox="0 0 24 24">
     <path d="M7.02051 9.50216C7.02051 9.01881 7.41237 8.62695 7.89571 8.62695C8.37909 8.62695 8.77091 9.01881 8.77091 9.50216V11.5248C8.77091 12.0082 8.37909 12.4 7.89571 12.4C7.41237 12.4 7.02051 12.0082 7.02051 11.5248V9.50216Z" fill="currentColor"/>
     <path d="M9.82117 9.50216C9.82117 9.01881 10.213 8.62695 10.6964 8.62695C11.1798 8.62695 11.5716 9.01881 11.5716 9.50216V11.5248C11.5716 12.0082 11.1798 12.4 10.6964 12.4C10.213 12.4 9.82117 12.0082 9.82117 11.5248V9.50216Z" fill="currentColor"/>