refactor(telemetry): text-only list empty states, distinct p50/p95 series

- paginated-list empty prop is a plain string, no icon block
- second sparkline series drawn in dimmed color; area disabled on dual charts
- duration legend shows latest p50/p95 values

src/features/activities/components/activities-table.tsx

@@ -1,7 +1,7 @@
 import { useState, useMemo } from "react";
 import { Trans, Plural, useLingui } from "@lingui/react/macro";
 import { Alert, Code, Container, Group, Stack, Text } from "@mantine/core";
-import { CheckIcon, XIcon, PulseIcon } from "@phosphor-icons/react";
+import { CheckIcon, XIcon } from "@phosphor-icons/react";
 import { Activity, ActivitySearchParams } from "../types";
 import { useActivities } from "../queries";
 import { usePlayers } from "@/features/players/queries";
@@ -129,7 +129,7 @@ export const ActivitiesTable = () => {
         <PaginatedList
           items={items}
           keyOf={(activity) => activity.id}
-          empty={{ icon: <PulseIcon size={32} />, title: t`No Activities Found` }}
+          empty={t`No Activities Found`}
           page={page}
           totalPages={result.totalPages}
           onPageChange={setPage}