feat: add admin workspace navigation

apps/web/src/styles/global.css

@@ -59,6 +59,9 @@ footer{min-height:118px;background:var(--deep);color:#dbe4df;padding:28px max(32
 /* One semantic treatment for empty, unavailable and invalid public states. */
 .state.unavailable-state{border-style:solid;border-color:color-mix(in srgb,var(--warning) 35%,var(--border));background:color-mix(in srgb,var(--warning-soft) 35%,var(--surface))}.state.error-state{background:color-mix(in srgb,var(--danger-soft) 28%,var(--surface))}.state>a{margin-top:8px;font-weight:750;text-underline-offset:4px}
 
+/* Admin navigation keeps all operational surfaces reachable by keyboard. */
+.admin-nav{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}.admin-nav a{padding:9px 13px;border:1px solid var(--line);border-radius:999px;color:var(--text-muted);font-size:12px;text-decoration:none}.admin-nav a:hover,.admin-nav a.active{border-color:var(--focus);color:var(--deep);background:var(--lime)}
+
 /* Action hierarchy stays semantic across public and admin surfaces. */
 [data-action]{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:0 18px;border:1px solid transparent;border-radius:10px;font-weight:750;text-decoration:none;transition:background-color var(--motion-fast) var(--ease-out),border-color var(--motion-fast) var(--ease-out),color var(--motion-fast) var(--ease-out),transform var(--motion-fast) var(--ease-out)}[data-action]:hover:not(:disabled){transform:translateY(-1px)}[data-action]:active:not(:disabled){transform:translateY(0)}[data-action="primary"]{background:var(--lime);color:var(--deep)}[data-action="secondary"]{border-color:var(--border);background:var(--surface-soft);color:var(--text-muted)}[data-action="inverse"]{border-color:#ffffff38;background:var(--deep);color:var(--white)}[data-action="danger"]{background:var(--danger-soft);color:var(--danger)}[data-action="quiet-danger"]{border-color:color-mix(in srgb,var(--danger) 35%,transparent);background:transparent;color:var(--danger)}[data-action="quiet"]{background:transparent;color:#d5dfdc;text-decoration:underline;text-underline-offset:4px}[data-action]:disabled{opacity:.55;cursor:not-allowed}