fix(dashboard): Tag input improvements

[desiprisg]

What changed? Why was the change needed?

• Show a disabled entry when the value types has already been added
• Handle overflowing tags in both popover and added tags.

  Screenshots

https://github.com/user-attachments/assets/6234c68c-0a9c-4e8d-98f7-4a4d4b29dd38

Expand for optional sections

### Related enterprise PR ### Special notes for your reviewer

[linear[bot]]

NV-4770 Tag input improvements

[netlify[bot]]

✅ Deploy Preview for novu-stg-vite-dashboard-poc ready!

Name	Link
🔨 Latest commit	04cb9342f5eb61b6ab6676b4eb8832dfa10d1b17
🔍 Latest deploy log	https://app.netlify.com/sites/novu-stg-vite-dashboard-poc/deploys/673765b3251a1e0008497232
😎 Deploy Preview	https://deploy-preview-7020--novu-stg-vite-dashboard-poc.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.