Fix: Render KB embed text in article views

[biast12]

Description

KB article rendering now includes stored embed description/fields in the message body (within a text budget) and uses safer embed access helpers to avoid nil-pointer edge cases. Article views also show a no-description placeholder only when nothing at all can be rendered, while preserving image rendering and button behavior. Additionally, the outdated /kb send TODO was removed, and ticket reopen limit replies now pass pluralized limit arguments with error styling.

Type of Change

• Bug fix
• New feature
• Breaking change

Testing

Do not have any kb categories
Use the /kb browse command - you should not see the "%!(EXTRA []interface {}=[])" at the end of the message
Use the command again, this time with a kb category and a kb article
The article should not have any content other than a description and an embed

Checklist

• My code follows the style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works