Fix broken terminal preview for long generated cloud-init YAML files

[iqlal]

Problem

The terminal preview in the app breaks or becomes unreadable when generating long cloud-init YAML files. This affects usability by hiding or distorting output for lengthy configurations.

Steps to Reproduce

1. Use the app to generate a cloud-init YAML with a large amount of configuration text (hundreds of lines).
2. Attempt to view the YAML in the terminal preview.

Expected Behavior

• The entire YAML should be visible, scrollable, and formatted properly regardless of the file's length.

Actual Behavior

• The preview layout overflows, compresses the text, or fails to render large files effectively.

Suggested Solution

• Investigate and update the terminal preview component/UI to support large file previews; consider adding line wrapping, scrollbar, or pagination if necessary.