feat: Voice Channel (#11602)

Enables agents to initiate outbound calls and receive incoming calls
directly from the Chatwoot dashboard, with Twilio as the initial
provider.

Fixes:  #11481 

> This is an integration branch to ensure features works well and might
be often broken on down merges, we will be extracting the
functionalities via smaller PRs into develop

- [x] https://github.com/chatwoot/chatwoot/pull/11775
- [x] https://github.com/chatwoot/chatwoot/pull/12218
- [x] https://github.com/chatwoot/chatwoot/pull/12243
- [x] https://github.com/chatwoot/chatwoot/pull/12268
- [x] https://github.com/chatwoot/chatwoot/pull/12361
- [x]  https://github.com/chatwoot/chatwoot/pull/12782
- [x] #13064
- [ ] Ability for agents to join the inbound calls ( included in this PR
)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/components-next/button/Button.vue

@@ -146,7 +146,7 @@ const STYLE_CONFIG = {
       solid:
         'bg-n-teal-9 text-white hover:enabled:bg-n-teal-10 focus-visible:bg-n-teal-10 outline-transparent',
       faded:
-        'bg-n-teal-9/10 text-n-slate-12 hover:enabled:bg-n-teal-9/20 focus-visible:bg-n-teal-9/20 outline-transparent',
+        'bg-n-teal-9/10 text-n-teal-11 hover:enabled:bg-n-teal-9/20 focus-visible:bg-n-teal-9/20 outline-transparent',
       outline:
         'text-n-teal-11 hover:enabled:bg-n-teal-9/10 focus-visible:bg-n-teal-9/10 outline-n-teal-9',
       link: 'text-n-teal-9 hover:enabled:underline focus-visible:underline outline-transparent',