feat: add AgentInstance detail page and improve AgentHealth

- New /agents/:appId/:instanceId page with process info, 3x2 charts
  grid (CPU, memory, throughput, errors, threads, GC), application
  log viewer with level filtering, and instance-scoped timeline
- AgentHealth now uses slide-in DetailPanel for quick instance preview
- Stat strip enhanced: colored StatusDot breakdowns, route ratio with
  state-colored values, Groups renamed to Applications
- Unified page structure: stat strip → scope trail with inline badges
  (removed duplicate section headers from both pages)
- StatCard value/detail props now accept ReactNode
- Log and timeline displayed side by side

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

src/pages/AgentInstance/AgentInstance.module.css

@@ -0,0 +1,229 @@
+.content {
+  flex: 1;
+  overflow-y: auto;
+  padding: 20px 24px 40px;
+  min-width: 0;
+  background: var(--bg-body);
+}
+
+.notFound {
+  padding: 60px;
+  text-align: center;
+  color: var(--text-faint);
+  font-size: 14px;
+}
+
+/* Stat strip — 5 columns matching /agents */
+.statStrip {
+  display: grid;
+  grid-template-columns: repeat(5, 1fr);
+  gap: 10px;
+  margin-bottom: 16px;
+}
+
+/* Scope trail — matches /agents */
+.scopeTrail {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  margin-bottom: 12px;
+  font-size: 12px;
+}
+
+.scopeLink {
+  color: var(--amber);
+  text-decoration: none;
+  font-weight: 500;
+}
+
+.scopeLink:hover {
+  text-decoration: underline;
+}
+
+.scopeSep {
+  color: var(--text-muted);
+  font-size: 10px;
+}
+
+.scopeCurrent {
+  color: var(--text-primary);
+  font-weight: 600;
+  font-family: var(--font-mono);
+}
+
+/* Section header — matches /agents */
+.sectionHeaderRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 12px;
+}
+
+.sectionTitle {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+/* Charts 3x2 grid */
+.chartsGrid {
+  display: grid;
+  grid-template-columns: 1fr 1fr 1fr;
+  gap: 14px;
+  margin-bottom: 20px;
+}
+
+.chartCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  padding: 16px;
+  overflow: hidden;
+}
+
+.chartHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.chartTitle {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.chartMeta {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+}
+
+/* Process info card */
+.processCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  padding: 16px;
+  margin-bottom: 20px;
+}
+
+.processGrid {
+  display: grid;
+  grid-template-columns: auto 1fr auto 1fr;
+  gap: 6px 16px;
+  font-size: 12px;
+  font-family: var(--font-body);
+  margin-top: 12px;
+}
+
+.processLabel {
+  color: var(--text-muted);
+  font-weight: 500;
+}
+
+.fdRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+/* Log + Timeline side by side */
+.bottomRow {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 14px;
+}
+
+/* Log viewer */
+.logCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
+}
+
+.logHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border-subtle);
+}
+
+.logEntries {
+  max-height: 360px;
+  overflow-y: auto;
+  font-size: 11px;
+}
+
+.logEntry {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+  padding: 5px 16px;
+  border-bottom: 1px solid var(--border-subtle);
+  font-family: var(--font-mono);
+  transition: background 0.1s;
+}
+
+.logEntry:hover {
+  background: var(--bg-hover);
+}
+
+.logEntry:last-child {
+  border-bottom: none;
+}
+
+.logTime {
+  flex-shrink: 0;
+  color: var(--text-muted);
+  min-width: 60px;
+}
+
+.logLogger {
+  flex-shrink: 0;
+  color: var(--text-faint);
+  max-width: 220px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.logMsg {
+  color: var(--text-primary);
+  font-family: var(--font-mono);
+  font-size: 11px;
+  word-break: break-word;
+}
+
+.logEmpty {
+  padding: 24px;
+  text-align: center;
+  color: var(--text-faint);
+  font-size: 12px;
+}
+
+/* Timeline card */
+.timelineCard {
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
+  display: flex;
+  flex-direction: column;
+  max-height: 420px;
+}
+
+.timelineHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border-subtle);
+}