[FEATURE]: dedicated subaagents' sidebar

[justindotdev-oss]

Feature hasn't been suggested before.

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

Describe the enhancement you want to request

it be nice if this subagents tasks had their own side bar (the left side)

[github-actions[bot]]

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

• #5000: opencode --continue doesn't restore state of previous subagent pane - discusses subagent pane management and navigation
• #5001: [FEATURE]: make subagent visually more distinctive - requests improved visual distinction for subagents to prevent confusion

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

[rekram1-node]

we did discuss this internally more to come on this soon