UI/UX Regression in v2: Centered layout reduces code readability & Lack of LLM logo (UPDATED)

Unfortunately, the current chat experience feels like a significant downgrade compared to v1 in terms of UI/UX.

The centered layout with large margins is the most critical issue. Code blocks are now confined to a narrow box, forcing constant horizontal scrolling to read even standard lines of code. v1 utilized the full width of the screen, which was far superior for programming workflows.

Additionally, the new font is harder to read. When chatting endlessly during development, clear typography is essential to reduce strain. The v1 font was better, and we really need the option to customize the font style or at least revert to the previous one.

Furthermore, the LLM logos are missing from the left sidebar. I can no longer distinguish which LLM model is associated with each chat history at a glance, which disrupts workflow organization.

While there has been technical improvement, the interface itself is a big downgrade. Please consider adding a "Full Width" toggle, font settings, and restoring the model logos to the lateral panel to match the usability we had in v1.