Add support for pinned threads in the sidebar

[Robrusi]

What changed

This PR adds support for pinning threads in the UI so important conversations are easier to keep in view.

Pinned threads now:

• Can be pinned and unpinned from the sidebar thread context menu
• Appear in a dedicated Pinned section above the project folders
• Still remain visible inside their original project folder
• Show a minimal folder indicator in the pinned section so it’s clear which project they belong to
• Stay pinned across reloads via persisted UI state

Why

Made it easier to keep track of important threads

Details

• Pin state is stored in the existing web UI state store
• Pinned threads are sorted ahead of unpinned threads
• Sidebar navigation keeps a deduplicated logical ordering so keyboard traversal and jump hints do not treat the same pinned thread as two separate entries

UI

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Testing

• bun fmt
• bun lint
• bun typecheck
• bun run test

---

Note

Medium Risk
Moderate risk: changes sidebar rendering/order and navigation indexes, plus persists new pinnedThreadIds in localStorage; regressions could affect thread selection, sorting, and post-delete navigation.

Overview
Adds pinned threads support in the sidebar: threads can now be pinned/unpinned via single- and multi-select context menus, and pinned items render in a new Pinned section above projects with a pin indicator and optional project folder suffix.

Updates thread ordering logic so sortThreadsForSidebar prioritizes isPinned, and rebuilds visibleSidebarThreadIds as pinned-first then projects with deduping to keep keyboard traversal/jump hints stable even when a thread appears in both places.

Extends uiStateStore to store/persist pinnedThreadIds (including pruning on syncThreads/clearThreadUi) and updates delete fallback selection in useThreadActions to respect pin ordering; includes new unit tests for pin state.

^{Reviewed by Cursor Bugbot for commit 9de609c. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add pinned threads support to the sidebar

• Introduces a Pinned section at the top of the sidebar that shows pinned threads with a pin icon and folder label suffix.
• Adds setThreadPinned to uiStateStore.ts, persisting pin state in localStorage and pruning stale ids when threads are deleted.
• Single and multi-select context menus expose a toggle-pin action; sortThreadsForSidebar in Sidebar.logic.ts now places pinned threads before unpinned ones.
• Fallback thread selection after deletion in useThreadActions.ts now respects pin ordering.
• Behavioral Change: visibleSidebarThreadIds (used for keyboard navigation) is rebuilt as pinned threads first, then per-project threads, deduplicated.

^{Macroscope summarized 9de609c.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 40e6eacd-3858-4814-9456-35b9c2535e74

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature allowing threads to be pinned in the sidebar, with new UI sections, sorting behavior, and persistence. While self-contained and including tests, new features that introduce user-facing behavior and workflows warrant human review to verify the implementation meets product expectations.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit b164956. Configure here.}