Feature request: option to disable auto-scroll while reading output

When the agent is generating output, the terminal automatically scrolls to the bottom as new content is appended. This makes it difficult to read earlier content in the session — as soon as you scroll up, the view jumps back down.

**Request:** Add a configuration option (or keyboard shortcut) to temporarily lock/disable auto-scroll, so users can freely read prior output without the view being forced to the latest content.

**Suggested UX options:**
- A toggle keybinding (e.g. `ctrl+s` or similar) to pause/resume auto-scroll
- A persistent config setting to disable auto-scroll globally

This is a common feature in terminal multiplexers and log viewers (e.g. `less`, tmux scroll mode) and would significantly improve readability during longer responses.

Start by locating the terminal output rendering and auto-scroll behavior, then review how scrolling up currently interacts with newly appended output. Compare the toggle-keybinding and persistent-config suggestions, and define one consistent pause/resume behavior whose completion can be verified while output is still generating.

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