[ajslater]

Summary

The library table's Poll and Force Update icons become one Vuetify labs VSplitBtn: Poll is the button, Force Update its menu item.

• Labs registration: vuetify({ autoImport: { labs: true } }), the same one-line change as vuetify-checkbox-groups, so whichever merges second applies cleanly.
• ConfirmDialog controlled mode: a modelValue prop (default null, since Vue casts an absent Boolean prop to false and would flip all existing consumers). Bound, the dialog renders no activator and reports every close, scrim click and Escape included, through update:modelValue. Unbound, it works as before.
• Library table: both confirmations sit outside the menu, controlled by the row, because the menu unmounts its content when it closes and would take a nested dialog with it. The split button uses density="comfortable" (28px in a group, the size of a lone compact icon) and a zero-padding toggle, and the action-cell dimming covers it.

Test plan

• New specs: confirm-dialog (both modes, scrim/Escape close), library-table-poll (button confirms then polls, menu item confirms then force-polls, cancel runs nothing). The existing mark-read-button specs pass unchanged.
• make lint, make test-frontend, make build-frontend pass.
• Checked in the dev stack at desktop (md and xl) and phone width: icon sizes match the edit/delete icons, the Force Update dialog stays open after the menu closes, Escape dismisses cleanly. On phones the menu chevron is a small (15×20px) target.

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