[ENHANCEMENT] Add concurrent conversation sidebar and task switching

[allquixotic]

Related GitHub Issue

Closes: #126

Description

This PR adds concurrent conversation support in the webview and provider layer.

Key changes:

• Adds an active conversation list in the chat UI.
• Tracks active task/conversation metadata so users can switch between live or recent conversations.
• Updates provider/webview message routing so actions apply to the selected conversation instead of implicitly targeting whatever task was most recently current.
• Adjusts task cancellation and state-posting behavior to avoid UI flicker and preserve task identity.
• Adds tests around conversation switching, provider behavior, and cancel/flicker regressions.

Reviewer focus:

• Whether all user actions route to the selected conversation.
• Whether switching conversations preserves visible state without leaking messages between tasks.
• Whether cancellation/resume behavior remains stable.

This PR was prepared with agentic AI assistance, then reviewed by a human. The underlying feature has been tested in production business use for several weeks in the contributor's fork.

This is opened as a draft until the linked issue is approved/assigned per Zoo Code's contribution process.

Test Procedure

From the Zoo Code worktree:

pnpm lint
pnpm check-types
pnpm --filter zoo-code test -- core/webview/__tests__/ClineProvider.spec.ts core/webview/__tests__/ClineProvider.flicker-free-cancel.spec.ts
pnpm --filter @roo-code/vscode-webview test -- src/components/chat/__tests__/ChatView.spec.tsx

Manual verification recommended:

• Start one Zoo task.
• Start or switch to a second conversation.
• Confirm both appear in the active conversation list.
• Switch back and forth and confirm each conversation keeps its own messages and status.
• Cancel one task and confirm the other conversation remains usable.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

TODO: Attach before/after screenshots or a short video showing the active conversation list and switching between two conversations.

Documentation Updates

• Yes, documentation updates are required. If Zoo Code has user docs for chat/task workflows, add a short section explaining active conversations and switching behavior.

Additional Notes

No duplicate issue found in Zoo's tracker.

Get in Touch

Discord: coorbin

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[github-actions]

This PR has had no activity for 60 days and will be automatically closed in 7 days unless there is new activity. If you'd like to continue, please rebase and leave a comment.

[github-actions]

Closing due to 60+ days of inactivity. Feel free to reopen if you'd like to resume this work.