feat: Add TikTok social profile display support (#13384)

Fixes
https://linear.app/chatwoot/issue/PLA-77/store-tiktok-user-id-in-contact-attributes
Adds support for displaying TikTok profile links in the contact sidebar,
matching the behavior of other social channels (Instagram, Facebook,
Twitter, etc.).

<img width="400" height="600" alt="CleanShot 2026-01-28 at 15 48 14@2x"
src="https://github.com/user-attachments/assets/c861e6af-6a45-40ff-a4bf-7d46b8937691"
/>

app/javascript/dashboard/routes/dashboard/conversation/contact/ContactForm.vue

@@ -174,6 +174,7 @@ export default {
         linkedin: socialProfiles.linkedin || '',
         github: socialProfiles.github || '',
         instagram: socialProfiles.instagram || '',
+        tiktok: socialProfiles.tiktok || '',
       };
     },
     getContactObject() {