Admin landing: pinned-first sidebar + numbered emoji card grid (fleet-uniform pattern, bs-mrlnhbp0y3n)

Fleet brainstorm bs-mrlnhbp0y3n (Elazar-opened, converged mars/pluto/venus/enamel 2026-07-15). Uniform admin-landing pattern, restyle-in-place (not a new page): (1) sidebar gets a 'Panel Admin' entry pinned FIRST for users holding Mars's admin-cap-set (match whatever requireCap set gates /administrar today, not a single cap); (2) rename page title from 'Panel Administración' to 'Panel Admin'; (3) landing content driven by ONE ordered config array [{order,emoji,label,href,cap}], sorted by order asc, per-card cap-filtered (don't render a card the user can't reach); (4) order values in +10 increments (10,20,30...) shown as a visible temporary numeric prefix on each card -- dropping the visible number is a LATER pass, not this WI; (5) keep existing breadcrumbs/back-link pattern from MARS-448/450 as-is, this WI only touches sidebar position/title/card-grid source+numbering+emojis. Non-link content (if any KPI/stat tiles exist on /administrar) stays untouched -- only link-cards get this treatment.