[Willem-Jaap]

Problem

With many active threads across several projects, the sidebar's single activity-sorted inbox interleaves projects, and each active thread takes a ~78px three-line card, so about ten fit on a laptop screen. The legacy sidebar groups by project but drops the Working, Snoozed and Settled shelves and settling/snoozing.

Change

Two settings in General → Sidebar, next to Project order. Both default to today's behaviour.

• Group threads by project (sidebarGroupThreadsByProject, default off): active threads render under collapsible project headers (icon, name, active count; on hover a chevron, project settings and new thread). Collapse state reuses projectExpandedById. Headers are drawn at render time around the active rows and don't join the drag model; dropping into the active list is disabled while grouped because rows follow project order. Pin and settle by drag still work. Project order follows the existing "Project order" setting and the project filter.
• Thread card style (sidebarThreadCardStyle: full | compact | row, default full): adds compact (title and status on one line, meta line only when present) and row (one 32px line in every section; under a project header it leads with status or branch) variants to SidebarThreadRow. Compact and Row use a new 13px text-xs-plus theme token for titles and project headers, and 14px icons.
• Grouped Full cards move the title onto the project line instead of repeating the project name.

Scope and approval

Prototype on my fork. Not yet discussed upstream: grouping is a product-behaviour change that needs an Ideas discussion first, and upstream this would likely split into two PRs (card style, then grouping).

Verification

• Ran vpr check:changed after rebasing onto the redesign (refactor(web): the new design is the only design, with no toggle pingdotgg/t3code#25778) and the settings regroup (refactor(web): settings group by concern, with General split into focused pages pingdotgg/t3code#25651): format, lint, knip, typecheck (32 packages) and 159 tests pass.
• Manually checked in a dev instance seeded with copied local data: grouping on and off; Full, Compact and Row; collapsing and expanding a project; the settings rows, search entries and reset buttons. Row heights measured 32px (Row and Compact without meta) and 50px (Compact with branch/PR), against 78px for Full.
• Not checked: mobile (untouched; it has its own sidebar), the legacy sidebar (untouched), drag-and-drop beyond pinning and settling while grouped, and diff counts (latestRunDiff returns null upstream, so +/− never render).

Screenshots

Sidebar at 1280×860, dark mode, on the redesigned UI (rebased on bc8d02ffd). Demo instance with copied local data.

Before (defaults)	Grouped + Full	Grouped + Compact

Grouped + Row	Compact, not grouped

Settings → General → Sidebar: