ux(users): bulk-action checkboxes have no visible target — wire up toolbar or remove #974

Symptom

In the Users section of Settings, each user row has a checkbox in front of it. Boxes can be checked / unchecked but nothing visible happens — no toolbar appears, no bulk-action button enables, no selection counter shows. The interaction is a dead end from the user's perspective.

What's actually in the code

The bulk-action infrastructure exists in frontend/src/users/:

• bulkDeleteUsers() — wired to button id #bulk-delete-btn (handlers.ts:66-69)
• bulkAddToGroup(groupId) — wired to button id #bulk-group-btn (handlers.ts:75-81)
• Selected-user state lives in frontend/src/users/state.ts

bulkChangeRole was removed in PR #912 when the role concept was dropped, and its button (#bulk-role-btn) was deliberately removed (handlers.ts:71).

The handlers use document.getElementById('bulk-delete-btn') etc. with a null guard — when the elements aren't in the DOM they silently no-op. That's almost certainly what's happening today: the buttons are missing from the rendered HTML so the checkboxes look non-functional.

Two ways to fix

(a) Surface the bulk actions — render #bulk-delete-btn + #bulk-group-btn (plus a group-picker for the latter) in the Users tab toolbar, visible when ≥1 user is selected. Optionally add a selection counter. The wiring is already in place; this is just the HTML/template side. Recommended since the logic, tests, and API endpoints exist.

(b) Remove the checkboxes — strip the per-row checkbox from the Users table template if you don't want to expose bulk actions to admins. Also remove the now-dead selection state and the bulkDeleteUsers / bulkAddToGroup functions.

Recommendation

Option (a). The work to bring back the existing bulk actions is ~one PR (toolbar render + show-on-selection + group-picker dropdown). The state, action functions, and backend endpoints already exist.

Acceptance

• Selecting ≥1 user row reveals a bulk-actions toolbar (or enables a previously-disabled toolbar)
• "Delete N users" button visible, confirms then calls bulkDeleteUsers()
• "Add to group..." dropdown visible, on selection calls bulkAddToGroup(groupId)
• Unchecking all rows hides/disables the toolbar
• Regression test in frontend/src/__tests__/users.test.ts covers the checkbox → toolbar → action wiring

Files likely touched

• frontend/src/users.ts or wherever the Users tab template lives
• frontend/src/users/handlers.ts
• frontend/src/users/state.ts (only if state shape needs adjustment)
• A new test in frontend/src/__tests__/users.test.ts