Dashboard terminology and filter placement cleanup

Problem/Motivation

The per-editor dashboard mixes "editor" and "user" terminology inconsistently (page title, menu item, table heading), and the month/year filter sits between the charts and the table instead of above everything it scopes.

Proposed resolution

Rename "Editor" to "User" in the per-editor dashboard's page title, menu item, and table heading, since the aggregation is per Drupal user account, not a role. Move the month/year filter above the KPI cards on both dashboards, since everything below it is scoped by that selection. Wrap the filter in a <fieldset>/<legend> instead of bare labels, so screen readers associate the grouping with its controls.

AI assistance

Yes.