[FEATURE]: Terminal long output lacks scrollbar for quick navigation

[NgChiKin]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

When using opencode in the terminal on my Mac, no scrollbar appears when the output is very long.
This makes it very slow to scroll back up, and there’s no way to drag a scrollbar to jump to a specific position.
Please consider adding a scrollbar or another faster way to navigate long output.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• scrollbars missing #2500: scrollbars missing - Users unable to scroll up to read long output, scrollbar appears as a solid bar
• Scrollbar is tiny on initial session load; resizing window fixes it #5605: Scrollbar is tiny on initial session load; resizing window fixes it - Scrollbar sizing issue on macOS
• Is there an easier way to scroll? #6257: Is there an easier way to scroll? - Request for easier scrolling navigation with keyboard shortcuts
• Scrolling #4495: Scrolling - Difficulty scrolling long chat sessions with mouse, request for faster scrollbar interaction
• [FEATURE]: Add ability to (un)mark points in the thread, to use as "bookmarks" #9227: Add ability to (un)mark points in the thread - Related feature request for better long-thread navigation with bookmarks

Feel free to ignore if none of these address your specific case.