fix(a11y): add aria-label to VTooltip on /admin/tenants impersonate btn

Audit #2 Phase 10.2 P2: axe-core 4.10 reported aria-tooltip-name
violation — <div role="tooltip"> had no accessible name. Adding
aria-label to <v-tooltip> passes it through to the rendered overlay.
Verified: axe-core on /admin/tenants — 0 tooltip violations post-fix.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/resources/js/components/admin/tenants/TenantsTable.vue

@@ -78,7 +78,11 @@ function statusColor(s: TenantStatus): string {
                 <span class="num text-medium-emphasis">{{ item.activitySince }}</span>
             </template>
             <template #[`item.actions`]="{ item }: { item: AdminTenant }">
-                <v-tooltip text="Войти как клиент (impersonation)" location="top">
+                <v-tooltip
+                    text="Войти как клиент (impersonation)"
+                    location="top"
+                    aria-label="Войти как клиент (impersonation)"
+                >
                     <template #activator="{ props: tipProps }">
                         <v-btn
                             v-bind="tipProps"