This pull request focuses on improving the UI and usability of the knowledge sources settings page, with minor adjustments to the chat renderer layout. The main changes include button redesigns for clarity and consistency, icon updates, and some style tweaks.

Knowledge Sources Settings Page UI Improvements:

• Redesigned action buttons for connected connectors: adjusted button sizes (size="md" and size="iconMd"), improved text truncation, and replaced the "Reconnect" and "Disconnect" icons with RefreshCcw and Trash2 for better clarity. The "Add Knowledge" button was also visually refined.
• Updated the "Connect" button and icon display: removed unnecessary margin classes from icons for a cleaner look.
• Simplified and corrected the dynamic className logic for the system prompt textarea and character count, making the code more readable.
• Added the RefreshCcw icon import to support the new reconnect button.

Chat Renderer Layout Adjustment:

• Increased the maximum width for small-width chat layouts from 850px to 920px for improved readability.

Closes #898