feat: replace text labels with icons in runtime cards

Use Activity, Cpu, and HeartPulse icons instead of "tps", "cpu", and
"ago" text in compact and expanded app cards. Bump design-system to
v0.1.55 for sidebar footer alignment fix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.module.css

@@ -111,6 +111,12 @@
   color: var(--text-muted);
 }
 
+.groupMeta > span {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+}
+
 .groupMeta strong {
   font-family: var(--font-mono);
   color: var(--text-secondary);
@@ -319,19 +325,31 @@
 .compactCardTps {
   font-family: var(--font-mono);
   color: var(--text-muted);
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
 }
 
 .compactCardCpu {
   font-family: var(--font-mono);
   color: var(--text-muted);
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
 }
 
 .compactCardHeartbeat {
   color: var(--text-muted);
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
 }
 
 .compactCardHeartbeatWarn {
   color: var(--card-accent);
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
 }
 
 /* Wrapper for each compact grid cell — anchor for overlay */

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -1,6 +1,6 @@
 import { useState, useMemo, useCallback, useRef, useEffect } from 'react';
 import { useParams, useNavigate } from 'react-router';
-import { ExternalLink, RefreshCw, Pencil, LayoutGrid, List, ChevronRight, ChevronDown, ArrowUp, ArrowDown, Search } from 'lucide-react';
+import { ExternalLink, RefreshCw, Pencil, LayoutGrid, List, ChevronRight, ChevronDown, ArrowUp, ArrowDown, Search, Cpu, HeartPulse, Activity } from 'lucide-react';
 import {
   StatCard, StatusDot, Badge, MonoText,
   GroupCard, DataTable, EventFeed,
@@ -141,15 +141,15 @@ function CompactAppCard({ group, onExpand, onNavigate }: { group: AppGroup; onEx
           {group.liveCount}/{group.instances.length} live
         </span>
         <span className={styles.compactCardTps}>
-          {group.totalTps.toFixed(1)} tps
+          <Activity size={10} /> {group.totalTps.toFixed(1)}/s
         </span>
         {group.maxCpu >= 0 && (
           <span className={styles.compactCardCpu}>
-            {(group.maxCpu * 100).toFixed(0)}% cpu
+            <Cpu size={10} /> {(group.maxCpu * 100).toFixed(0)}%
           </span>
         )}
         <span className={isHealthy ? styles.compactCardHeartbeat : styles.compactCardHeartbeatWarn}>
-          {heartbeat ? timeAgo(heartbeat) : '\u2014'}
+          <HeartPulse size={10} /> {heartbeat ? timeAgo(heartbeat, true) : '\u2014'}
         </span>
       </div>
     </div>
@@ -763,20 +763,9 @@ export default function AgentHealth() {
               }
               meta={
                 <div className={styles.groupMeta}>
-                  <span><strong>{group.totalTps.toFixed(1)}</strong> msg/s</span>
+                  <span><Activity size={12} /> <strong>{group.totalTps.toFixed(1)}</strong>/s</span>
                   <span><strong>{group.totalActiveRoutes}</strong>/{group.totalRoutes} routes</span>
-                  {group.maxCpu >= 0 && <span><strong>{(group.maxCpu * 100).toFixed(0)}%</strong> cpu</span>}
-                  <span>
-                    <StatusDot
-                      variant={
-                        appHealth(group) === 'success'
-                          ? 'live'
-                          : appHealth(group) === 'warning'
-                            ? 'stale'
-                            : 'dead'
-                      }
-                    />
-                  </span>
+                  {group.maxCpu >= 0 && <span><Cpu size={12} /> <strong>{(group.maxCpu * 100).toFixed(0)}%</strong></span>}
                 </div>
               }
               footer={
@@ -860,20 +849,9 @@ export default function AgentHealth() {
                     }
                     meta={
                       <div className={styles.groupMeta}>
-                        <span><strong>{group.totalTps.toFixed(1)}</strong> msg/s</span>
+                        <span><Activity size={12} /> <strong>{group.totalTps.toFixed(1)}</strong>/s</span>
                         <span><strong>{group.totalActiveRoutes}</strong>/{group.totalRoutes} routes</span>
-                        {group.maxCpu >= 0 && <span><strong>{(group.maxCpu * 100).toFixed(0)}%</strong> cpu</span>}
-                        <span>
-                          <StatusDot
-                            variant={
-                              appHealth(group) === 'success'
-                                ? 'live'
-                                : appHealth(group) === 'warning'
-                                  ? 'stale'
-                                  : 'dead'
-                            }
-                          />
-                        </span>
+                        {group.maxCpu >= 0 && <span><Cpu size={12} /> <strong>{(group.maxCpu * 100).toFixed(0)}%</strong></span>}
                       </div>
                     }
                     footer={

ui/src/utils/format-utils.ts

@@ -24,16 +24,17 @@ export function statusLabel(s: string): string {
   return s.charAt(0).toUpperCase() + s.slice(1).toLowerCase();
 }
 
-export function timeAgo(iso?: string): string {
+export function timeAgo(iso?: string, short = false): string {
   if (!iso) return '\u2014';
   const diff = Date.now() - new Date(iso).getTime();
   const secs = Math.floor(diff / 1000);
-  if (secs < 60) return `${secs}s ago`;
+  const suffix = short ? '' : ' ago';
+  if (secs < 60) return `${secs}s${suffix}`;
   const mins = Math.floor(secs / 60);
-  if (mins < 60) return `${mins}m ago`;
+  if (mins < 60) return `${mins}m${suffix}`;
   const hours = Math.floor(mins / 60);
-  if (hours < 24) return `${hours}h ago`;
-  return `${Math.floor(hours / 24)}d ago`;
+  if (hours < 24) return `${hours}h${suffix}`;
+  return `${Math.floor(hours / 24)}d${suffix}`;
 }
 
 export function formatMetric(value: number, unit: string, decimals = 1): string {