Test decoder button does not look like a button

[vlasebian]

Summary

The Test Decoder button for end device custom payload formatters does not look good.

Steps to Reproduce

1. Create an application
2. Create an end device
3. Go to the end device overview, click on the payload formatters tab and scroll down to the test section.

Current Result

The button does not have a design that suggests it's a button, it's just plain text.

Expected Result

The button should have a design that suggests it's a button.

Relevant Logs

No response

URL

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Deployment

The Things Stack Enterprise (self-hosted)

The Things Stack Version

No response

Client Name and Version

The Things Stack for LoRaWAN: ttn-lw-stack
Version:             3.33.0-dev
Go version:          go1.23.3
OS/Arch:             darwin/arm64

Other Information

No response

Proposed Fix

No response

Contributing

• I can help by doing more research.
• I can help by implementing a fix after the proposal above is approved.
• I can help by testing the fix before it's released.

Validation

• The fix is tested in a staging environment.
• The fix is documented in The Things Stack Documentation

Code of Conduct

• I agree to follow TTN's Community Code of Conduct.