feat(web): filter the sidebar by several projects at once

[c0nsoleg]

The project filter was a radio menu: all projects, or one. If you're working
in two repos at the same time you end up flipping it back and forth all day.

It's checkboxes now.

Before

After

Tests: 4 new ones for the toggle/prune helpers, plus typecheck and lint on
the changed files.

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Note

Low Risk
Client-only sidebar filter UX and local state; no auth, persistence, or API changes.

Overview
The sidebar project filter moves from single-select to multi-select: an empty checkbox selection still means all projects, but users can check several logical projects and see the union of their threads without flipping the menu back and forth.

State is now projectScopeKeys (array) instead of one nullable key. toggleProjectScopeKey and pruneProjectScopeKeys in Sidebar.logic handle add/remove and drop stale keys when project groups disappear. The filter menu uses MenuCheckboxItem with closeOnClick={false} so the menu stays open while toggling; the trigger shows one project’s favicon/name when exactly one is selected, “All projects” when none, or “N projects” when several.

Pagination reset and bulk-selection clearing key off projectScopeSelectionKey (sorted set of keys, or "all"), so reordering picks alone does not reset settled paging or selection.

^{Reviewed by Cursor Bugbot for commit b6ba5a9. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Update Sidebar to support filtering by multiple projects

• Updates the Sidebar component to allow users to filter by multiple projects simultaneously instead of a single project.
• Replaces projectScopeKey with projectScopeKeys (readonly string array) and introduces toggleProjectScopeKey and pruneProjectScopeKeys utilities to manage selection state.
• Changes the project filter menu from a radio group to a checkbox list that remains open while toggling selections, and updates empty-state messages to handle zero, one, or multiple selections.
• Resets pagination and clears row selection only when the effective set of scoped projects changes, using the new projectScopeSelectionKey.
• Behavioral Change: The filter UI switches from single-select radio buttons to multi-select checkboxes, and stale project selections are pruned automatically when available projects change.

^{Macroscope summarized b6ba5a9.}

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The sidebar filter changes from single-select to persistent multi-select and changes the effective thread/draft set, selection state, and settled pagination behavior. The work is localized client-side code with helper tests and no backend or schema changes, but it introduces a new user-facing workflow with several coordinated runtime effects.

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