Add configurable sidebar thread preview count

[Marve10s]

What changed

• Adds a configurable visible-thread count for the sidebar, clamped to 2-10.
• Replaces the old radio-style count picker with a compact - / numeric input / + control.
• Persists the setting in client settings and migrates legacy values.

Notes

• The input is text-based so the browser spinner arrows do not appear.
• The control is inside the sidebar menu, so key handling is stopped at capture phase to keep typed digits editable.
• This branch also still includes the dev bootstrap fix in apps/web/vite.config.ts that was needed to verify the app locally.

Validation

• bun fmt
• bun lint
• bun typecheck

---

Note

Low Risk
Primarily UI and client-side settings schema changes; risk is limited to sidebar rendering/interaction and settings persistence defaults.

Overview
Adds a new client setting, sidebarThreadPreviewCount (default 6, clamped 2–10), to the shared settings contracts and updates persistence tests to include it.

Updates the web sidebar to replace the hardcoded thread preview limit with the user setting, and adds a "Visible threads" +/- + numeric input control to the sidebar options menu to update the setting. Settings restore-defaults confirmation now also lists "Visible threads" when this value differs from default.

^{Reviewed by Cursor Bugbot for commit 02fce1a. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add configurable sidebar thread preview count with controls in sidebar options menu

• Adds a sidebarThreadPreviewCount field to ClientSettings with a default of 6 and a valid range of [2, 10], defined in settings.ts.
• Replaces the fixed THREAD_PREVIEW_LIMIT in the sidebar with the user-configured value for both collapsed project previews and per-project thread slicing.
• Exposes increment/decrement buttons and a numeric input in the sidebar options menu (ProjectSortMenu) to adjust the count, which persists to client settings.
• Restoring defaults now includes resetting sidebarThreadPreviewCount to 6.

^{Macroscope summarized 02fce1a.}

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[Marve10s]

Why ? When working on more than 3+ projects with default thread number, I need to scroll. Instead, I'd prefer to have less threads because I don't need 6 by default while working on multiple stuff.
https://github.com/user-attachments/assets/7645ee08-478c-44fc-8fbb-4157a4821bac

[macroscopeapp]

Approvability

Verdict: Approved

Straightforward UI feature adding a user-configurable sidebar thread preview count setting. Replaces a hardcoded constant (6) with a bounded configurable value (2-10, default 6). Changes are self-contained to the sidebar UI and settings schema with no backend or runtime behavior implications beyond the visual preference.

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[Marve10s]

Approvability

Verdict: Needs human review

The sidebar thread preview count feature itself is straightforward, but there is an unresolved high-severity bug comment identifying that the vite.config.ts changes may cause startup crashes when VITE_WS_URL is not configured. This unrelated change bundled into the PR requires human attention.

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fyi Added by accident, PR is no longer contains Vite config changes

[cursor]

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

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^{Reviewed by Cursor Bugbot for commit bb60b2c. Configure here.}

Dismissing prior approval to re-evaluate 02fce1a