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diff --git a/ui/src/components/logs/derive-trace-groups.ts b/ui/src/components/logs/derive-trace-groups.ts
index 4638e6b1..a533fc38 100644
--- a/ui/src/components/logs/derive-trace-groups.ts
+++ b/ui/src/components/logs/derive-trace-groups.ts
@@ -6,55 +6,138 @@ const LEVEL_RANK: Record<LogsLevel, number> = { debug: 0, info: 1, warn: 2, erro
 export interface LeafItem {
   kind: 'leaf';
   entry: LogsEntry;
+  /**
+   * When >1, this leaf represents N consecutive identical entries that have
+   * been coalesced. Row renderer shows a ×N badge so dashboard self-polling
+   * floods don't drown real signal.
+   */
+  repeatCount?: number;
+  collapsedRange?: { fromTs: string; toTs: string };
 }
 
 export type DerivedItem = LeafItem | TraceGroup;
 
 /**
- * Pure helper: derive a flat list of either standalone leaves or trace groups
- * (entries sharing a `requestId`). Stable, single-pass, O(n).
+ * Tuple key for coalescing standalone leaves. Includes `message` and
+ * `source` so two adjacent logs that share event/module/level but report
+ * different content (or come from a different service) stay distinct
+ * (e.g. `User logged in: alice` and `User logged in: bob`). Excludes
+ * `latencyMs` and `metadata` because those drift per request even on
+ * truly redundant polls — including them would prevent any coalescing.
  *
- * Sort within a group is `ts asc` (defensive — backend may not guarantee it).
- * Group ts = min child ts, used to slot the group amongst standalone leaves.
- * Standalone leaves keep their original `ts` slot — never silently dropped.
+ * NB: this only applies to *leaves* (entries without `requestId`). Trace
+ * children render uncoalesced so retries and duplicated-stage emissions
+ * stay individually inspectable.
+ */
+function coalesceKey(entry: LogsEntry): string {
+  return [
+    entry.event ?? '',
+    entry.message ?? '',
+    entry.stage ?? '',
+    entry.module ?? entry.source ?? '',
+    entry.level,
+    entry.requestId ?? '',
+    entry.source ?? '',
+  ].join(' ');
+}
+
+/**
+ * For an entry without an explicit `stage` field, derive a short chip label
+ * from the event name so the trace timeline still renders meaningful badges
+ * instead of empty pills. Last `.`-segment, capped at 12 chars.
+ */
+export function deriveStageHint(entry: LogsEntry): string | undefined {
+  if (entry.stage && entry.stage.length > 0) return entry.stage;
+  if (entry.event && entry.event.length > 0) {
+    const last = entry.event.split('.').pop() ?? entry.event;
+    return last.slice(0, 12);
+  }
+  return undefined;
+}
+
+/**
+ * Pure helper: derive a list of either standalone leaves or trace groups
+ * (entries sharing a `requestId`).
+ *
+ * Single-pass, O(n). Walks `entries` in input order so leaf coalescing
+ * sees the *real* adjacency: a leaf only extends the previous leaf when
+ * no other entry (trace child included) appeared between them. This
+ * preserves signal — two identical no-requestId entries split by an
+ * unrelated trace stay as two separate rows, not a fake `×2`.
+ *
+ * Trace groups gather all children sharing a requestId regardless of
+ * interleaving; they're sorted by `ts asc` before display, with the
+ * group's positional `ts` set to the oldest child so it slots correctly
+ * in the reverse-chronological display sort below. Children are NOT
+ * coalesced — every stage is preserved for individual inspection.
  */
 export function deriveTraceGroups(entries: LogsEntry[]): DerivedItem[] {
-  const groups = new Map<string, LogsEntry[]>();
-  const leaves: LeafItem[] = [];
+  const items: DerivedItem[] = [];
+  const traceIndex = new Map<string, number>(); // requestId -> index in items
+  let lastLeafIdx = -1;
+  let lastLeafKey = '';
+
   for (const entry of entries) {
     if (entry.requestId) {
-      const bucket = groups.get(entry.requestId);
-      if (bucket) bucket.push(entry);
-      else groups.set(entry.requestId, [entry]);
+      // Trace child. Append to existing group or create one.
+      const existingIdx = traceIndex.get(entry.requestId);
+      if (existingIdx !== undefined) {
+        (items[existingIdx] as TraceGroup).children.push(entry);
+      } else {
+        const grp: TraceGroup = {
+          kind: 'trace',
+          requestId: entry.requestId,
+          module: entry.module ?? entry.source,
+          source: entry.source,
+          ts: entry.timestamp,
+          maxLevel: entry.level,
+          totalLatencyMs: 0,
+          children: [entry],
+        };
+        items.push(grp);
+        traceIndex.set(entry.requestId, items.length - 1);
+      }
+      // A trace entry breaks any leaf-run adjacency.
+      lastLeafIdx = -1;
+      lastLeafKey = '';
     } else {
-      leaves.push({ kind: 'leaf', entry });
+      // Standalone leaf.
+      const key = coalesceKey(entry);
+      if (lastLeafIdx >= 0 && key === lastLeafKey) {
+        const prev = items[lastLeafIdx] as LeafItem;
+        prev.repeatCount = (prev.repeatCount ?? 1) + 1;
+        prev.collapsedRange = {
+          fromTs: prev.collapsedRange?.fromTs ?? prev.entry.timestamp,
+          toTs: entry.timestamp,
+        };
+      } else {
+        const leaf: LeafItem = { kind: 'leaf', entry };
+        items.push(leaf);
+        lastLeafIdx = items.length - 1;
+        lastLeafKey = key;
+      }
     }
   }
 
-  const groupItems: TraceGroup[] = [];
-  for (const [requestId, children] of groups) {
-    const sorted = [...children].sort((a, b) => a.timestamp.localeCompare(b.timestamp));
-    let maxLevel: LogsLevel = 'debug';
-    let total = 0;
-    for (const c of sorted) {
-      if (LEVEL_RANK[c.level] > LEVEL_RANK[maxLevel]) maxLevel = c.level;
-      if (typeof c.latencyMs === 'number') total += c.latencyMs;
+  // Finalize trace groups: sort children, compute aggregates, set group ts.
+  for (const item of items) {
+    if (item.kind === 'trace') {
+      item.children.sort((a, b) => a.timestamp.localeCompare(b.timestamp));
+      let maxLevel: LogsLevel = 'debug';
+      let total = 0;
+      for (const c of item.children) {
+        if (LEVEL_RANK[c.level] > LEVEL_RANK[maxLevel]) maxLevel = c.level;
+        if (typeof c.latencyMs === 'number') total += c.latencyMs;
+      }
+      item.maxLevel = maxLevel;
+      item.totalLatencyMs = total;
+      const head = item.children[0];
+      if (head) item.ts = head.timestamp;
     }
-    const head = sorted[0];
-    if (!head) continue;
-    groupItems.push({
-      kind: 'trace',
-      requestId,
-      module: head.module ?? head.source,
-      source: head.source,
-      ts: head.timestamp,
-      maxLevel,
-      totalLatencyMs: total,
-      children: sorted,
-    });
   }
 
-  return [...groupItems, ...leaves].sort((a, b) => {
+  // Display sort: newest first.
+  return items.sort((a, b) => {
     const at = a.kind === 'trace' ? a.ts : a.entry.timestamp;
     const bt = b.kind === 'trace' ? b.ts : b.entry.timestamp;
     return bt.localeCompare(at);
diff --git a/ui/src/components/logs/logs-detail-panel.tsx b/ui/src/components/logs/logs-detail-panel.tsx
index 9f977127..09c68564 100644
--- a/ui/src/components/logs/logs-detail-panel.tsx
+++ b/ui/src/components/logs/logs-detail-panel.tsx
@@ -7,7 +7,13 @@ import type { LogsEntry } from '@/lib/api-client';
 import { cn } from '@/lib/utils';
 import { LogLevelBadge } from './log-level-badge';
 import { LogsEmpty } from './logs-empty';
-import { formatJson } from './utils';
+import {
+  formatJson,
+  getDisplayLatency,
+  getDisplayModule,
+  getDisplayRequestId,
+  getDisplayStage,
+} from './utils';
 import { FOCUS_RING, MONO_NUMERIC } from './tokens';
 
 export interface LogsDetailPanelProps {
@@ -26,19 +32,15 @@ interface OverviewRow {
 }
 
 function buildOverviewRows(entry: LogsEntry, sourceLabel?: string): OverviewRow[] {
+  // Use shared accessors so this panel and the list row never diverge.
   return [
     { label: 'Time', value: new Date(entry.timestamp).toISOString(), mono: true },
     { label: 'Level', value: entry.level },
-    { label: 'Module', value: entry.module ?? '—' },
-    { label: 'Stage', value: entry.stage ?? '—' },
-    { label: 'Request ID', value: entry.requestId ?? '—', mono: true },
-    {
-      label: 'Latency',
-      value:
-        entry.latencyMs !== undefined && entry.latencyMs !== null ? `${entry.latencyMs}ms` : '—',
-      mono: true,
-    },
-    { label: 'Source', value: sourceLabel ?? entry.source },
+    { label: 'Module', value: getDisplayModule(entry, sourceLabel) },
+    { label: 'Stage', value: getDisplayStage(entry) },
+    { label: 'Request ID', value: getDisplayRequestId(entry), mono: true },
+    { label: 'Latency', value: getDisplayLatency(entry), mono: true },
+    { label: 'Source', value: sourceLabel ?? entry.source ?? '—' },
     { label: 'Run ID', value: entry.runId ?? '—', mono: true },
     { label: 'Process ID', value: entry.processId ?? '—', mono: true },
   ];
diff --git a/ui/src/components/logs/logs-entry-list.tsx b/ui/src/components/logs/logs-entry-list.tsx
index b03687e8..f8fe46dc 100644
--- a/ui/src/components/logs/logs-entry-list.tsx
+++ b/ui/src/components/logs/logs-entry-list.tsx
@@ -24,8 +24,13 @@ export interface LogsEntryListProps {
   density?: RowDensity;
 }
 
+// Column layout shared by the header and every row variant:
+//   chevron(16) · time(88) · level(64) · stage(72) · module(140) · message(flex) · latency(72) · request(112)
+// The dedicated `stage` column is rendered as an empty span on rows that
+// have no stage hint so column edges align across leaf, trace head, and
+// trace child rows alike.
 const COLS_TEMPLATE =
-  'grid grid-cols-[88px_64px_140px_minmax(0,1fr)_72px_88px] items-center gap-3 px-3';
+  'grid grid-cols-[16px_88px_64px_72px_140px_minmax(0,1fr)_72px_112px] items-center gap-3 px-3';
 
 export function LogsEntryList({
   entries,
@@ -38,30 +43,72 @@ export function LogsEntryList({
   density = 'cozy',
 }: LogsEntryListProps) {
   const items = useMemo(() => deriveTraceGroups(entries), [entries]);
-  const [expanded, setExpanded] = useState<Set<string>>(new Set());
+  // Two-set tristate: `userExpanded` = explicitly opened, `userCollapsed`
+  // = explicitly closed. Auto-expand (when selection lives inside a trace)
+  // only fires when the id is in neither set, so a user click on an
+  // auto-expanded chevron actually collapses — previously it added to
+  // `expanded` while auto-expand kept showing it, so no visible change.
+  const [userExpanded, setUserExpanded] = useState<Set<string>>(new Set());
+  const [userCollapsed, setUserCollapsed] = useState<Set<string>>(new Set());
 
-  const toggle = useCallback((requestId: string) => {
-    setExpanded((prev) => {
-      const next = new Set(prev);
-      if (next.has(requestId)) next.delete(requestId);
-      else next.add(requestId);
-      return next;
-    });
-  }, []);
-
-  // Auto-expand the trace whose child is currently selected.
-  const effectiveExpanded = useMemo(() => {
-    if (!selectedEntryId) return expanded;
+  // Compute the auto-expand id (if any) — derived inside toggle and the
+  // effective set so a single source of truth drives both render and
+  // click logic.
+  const autoExpandedId = useMemo(() => {
+    if (!selectedEntryId) return null;
     const owning = items.find(
       (it) => it.kind === 'trace' && it.children.some((c) => c.id === selectedEntryId)
     );
-    if (owning && owning.kind === 'trace' && !expanded.has(owning.requestId)) {
-      const next = new Set(expanded);
-      next.add(owning.requestId);
-      return next;
+    return owning && owning.kind === 'trace' ? owning.requestId : null;
+  }, [items, selectedEntryId]);
+
+  const toggle = useCallback(
+    (requestId: string) => {
+      const isAutoExpanded = autoExpandedId === requestId;
+      const isExplicitlyOpen = userExpanded.has(requestId);
+      const isExplicitlyClosed = userCollapsed.has(requestId);
+      const isCurrentlyOpen = isExplicitlyOpen || (isAutoExpanded && !isExplicitlyClosed);
+
+      if (isCurrentlyOpen) {
+        // Close: clear user-open, mark user-closed (beats auto-expand).
+        setUserExpanded((prev) => {
+          if (!prev.has(requestId)) return prev;
+          const next = new Set(prev);
+          next.delete(requestId);
+          return next;
+        });
+        setUserCollapsed((prev) => {
+          if (prev.has(requestId)) return prev;
+          const next = new Set(prev);
+          next.add(requestId);
+          return next;
+        });
+      } else {
+        // Open: clear user-closed, mark user-open.
+        setUserExpanded((prev) => {
+          if (prev.has(requestId)) return prev;
+          const next = new Set(prev);
+          next.add(requestId);
+          return next;
+        });
+        setUserCollapsed((prev) => {
+          if (!prev.has(requestId)) return prev;
+          const next = new Set(prev);
+          next.delete(requestId);
+          return next;
+        });
+      }
+    },
+    [autoExpandedId, userExpanded, userCollapsed]
+  );
+
+  const effectiveExpanded = useMemo(() => {
+    const result = new Set(userExpanded);
+    if (autoExpandedId && !userCollapsed.has(autoExpandedId)) {
+      result.add(autoExpandedId);
     }
-    return expanded;
-  }, [expanded, items, selectedEntryId]);
+    return result;
+  }, [userExpanded, userCollapsed, autoExpandedId]);
 
   const renderItem = useCallback(
     (_index: number, item: DerivedItem) => {
@@ -85,6 +132,7 @@ export function LogsEntryList({
           density={density}
           sourceLabel={sourceLabels[item.entry.source] ?? item.entry.source}
           onSelect={onSelect}
+          repeatCount={item.repeatCount}
         />
       );
     },
@@ -98,11 +146,13 @@ export function LogsEntryList({
         role="row"
         className={cn(
           COLS_TEMPLATE,
-          'h-8 shrink-0 border-b border-border bg-muted/30 text-[10px] font-medium uppercase tracking-wide text-muted-foreground'
+          'h-9 shrink-0 border-b border-border bg-muted/30 text-[12px] font-medium uppercase tracking-wide text-muted-foreground'
         )}
       >
+        <span role="columnheader" aria-hidden="true" />
         <span role="columnheader">Time</span>
         <span role="columnheader">Level</span>
+        <span role="columnheader">Stage</span>
         <span role="columnheader">Module</span>
         <span role="columnheader">Message</span>
         <span role="columnheader" className="text-right">
diff --git a/ui/src/components/logs/logs-filters.tsx b/ui/src/components/logs/logs-filters.tsx
index f1c4436c..4d00d830 100644
--- a/ui/src/components/logs/logs-filters.tsx
+++ b/ui/src/components/logs/logs-filters.tsx
@@ -44,6 +44,9 @@ export interface LogsFiltersProps {
   onRequestIdChange?: (v: string) => void;
   timeWindow?: LogsTimeWindow;
   onTimeWindowChange?: (v: LogsTimeWindow) => void;
+  /** When true, hides entries from `web-server:*` sources. Default ON. */
+  hideDashboardInternals?: boolean;
+  onHideDashboardInternalsChange?: (next: boolean) => void;
   onClearAll?: () => void;
 }
 
@@ -88,6 +91,8 @@ export function LogsFilters({
   onRequestIdChange,
   timeWindow = 'all',
   onTimeWindowChange,
+  hideDashboardInternals = true,
+  onHideDashboardInternalsChange,
   onClearAll,
 }: LogsFiltersProps) {
   const [advancedOpen, setAdvancedOpen] = useState(false);
@@ -312,6 +317,31 @@ export function LogsFilters({
               </Select>
             </div>
           ) : null}
+          {onHideDashboardInternalsChange ? (
+            <div className="flex items-start justify-between gap-3 rounded border border-border/60 bg-muted/20 p-2">
+              <div className="space-y-0.5">
+                <Label
+                  htmlFor="logs-hide-internals"
+                  className="block text-[12px] font-medium text-foreground"
+                >
+                  Hide dashboard internals
+                </Label>
+                <p className="text-[11px] text-muted-foreground">
+                  Suppress <code className="rounded bg-background px-1">web-server:*</code>{' '}
+                  self-polling.
+                </p>
+              </div>
+              <input
+                id="logs-hide-internals"
+                type="checkbox"
+                role="switch"
+                checked={hideDashboardInternals}
+                onChange={(e) => onHideDashboardInternalsChange(e.target.checked)}
+                className={cn('mt-0.5 h-4 w-4 cursor-pointer accent-foreground', FOCUS_RING)}
+                aria-label="Hide dashboard internals"
+              />
+            </div>
+          ) : null}
         </CollapsibleContent>
       </Collapsible>
 
diff --git a/ui/src/components/logs/logs-header.tsx b/ui/src/components/logs/logs-header.tsx
index 4eee6979..e403b905 100644
--- a/ui/src/components/logs/logs-header.tsx
+++ b/ui/src/components/logs/logs-header.tsx
@@ -1,29 +1,40 @@
 import { RefreshCw, Settings, ScrollText, HelpCircle } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { cn } from '@/lib/utils';
-import { FOCUS_RING } from './tokens';
+import { FOCUS_RING, MONO_NUMERIC } from './tokens';
+
+export interface LogsHeaderStats {
+  entries: number;
+  traces: number;
+  errors: number;
+}
 
 export interface LogsHeaderProps {
   isFetching: boolean;
   hasError: boolean;
   capturedCount: number;
+  stats?: LogsHeaderStats;
   onRefresh: () => void;
   onOpenSettings: () => void;
   onOpenShortcuts: () => void;
 }
 
 /**
- * Calm 48px header for the logs surface.
- * - Title + icon on the left
- * - Live connection pill in the middle (idle/syncing/error)
- * - Refresh + settings buttons on the right
+ * Logs page header.
  *
- * No glows, no decorative captions, no scale animations.
+ * Two rows:
+ * 1. Title bar (`LOGS.STREAM` ornamental marker matching dashboard's
+ *    `HEALTH.X` design language) + status pill + actions.
+ * 2. Stat strip — entries / traces / errors counters mirroring the home
+ *    page's `LIVE Account Monitor` card grid.
+ *
+ * Visual unity is the goal here, not minimalism for its own sake.
  */
 export function LogsHeader({
   isFetching,
   hasError,
   capturedCount,
+  stats,
   onRefresh,
   onOpenSettings,
   onOpenShortcuts,
@@ -35,56 +46,102 @@ export function LogsHeader({
     status === 'error' ? 'bg-red-500' : status === 'syncing' ? 'bg-amber-500' : 'bg-emerald-500';
 
   return (
-    <div className="flex h-12 shrink-0 items-center justify-between border-b border-border bg-background px-4">
-      <div className="flex items-center gap-3">
-        <ScrollText className="h-4 w-4 text-foreground/70" aria-hidden="true" />
-        <h1 className="text-sm font-semibold tracking-tight text-foreground">Logs</h1>
-        <span
-          role="status"
-          className="ml-3 inline-flex items-center gap-1.5 rounded-full border border-border bg-muted/40 px-2 py-0.5 text-[11px] font-medium text-foreground/70"
-        >
-          <span className={cn('h-1.5 w-1.5 rounded-full', dotClass)} aria-hidden="true" />
-          {statusLabel}
-        </span>
-        <span className="text-[11px] font-medium tabular-nums text-muted-foreground">
-          {capturedCount} entries
-        </span>
+    <div className="shrink-0 border-b border-border bg-background">
+      <div className="flex h-14 items-center justify-between gap-4 px-4">
+        <div className="flex items-center gap-3">
+          <ScrollText className="h-4 w-4 text-foreground/70" aria-hidden="true" />
+          <span className="text-[11px] font-mono uppercase tracking-[0.18em] text-muted-foreground">
+            LOGS.STREAM
+          </span>
+          <h1 className="text-base font-semibold tracking-tight text-foreground">Live activity</h1>
+          <span
+            role="status"
+            aria-live="polite"
+            className="ml-2 inline-flex items-center gap-1.5 rounded-full border border-border bg-muted/40 px-2.5 py-0.5 text-[12px] font-medium text-foreground/80"
+          >
+            <span className={cn('h-1.5 w-1.5 rounded-full', dotClass)} aria-hidden="true" />
+            {statusLabel}
+          </span>
+        </div>
+
+        <div className="flex items-center gap-1.5">
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={onRefresh}
+            aria-label="Refresh logs"
+            className={cn('h-8 gap-2 px-2.5 text-xs font-medium', FOCUS_RING)}
+          >
+            <RefreshCw
+              className={cn('h-3.5 w-3.5', isFetching && 'animate-spin')}
+              aria-hidden="true"
+            />
+            Refresh
+          </Button>
+          <Button
+            variant="ghost"
+            size="icon"
+            onClick={onOpenShortcuts}
+            aria-label="Show keyboard shortcuts"
+            title="Keyboard shortcuts (?)"
+            className={cn('h-8 w-8', FOCUS_RING)}
+          >
+            <HelpCircle className="h-4 w-4" aria-hidden="true" />
+          </Button>
+          <Button
+            variant="ghost"
+            size="icon"
+            onClick={onOpenSettings}
+            aria-label="Open logging settings"
+            className={cn('h-8 w-8', FOCUS_RING)}
+          >
+            <Settings className="h-4 w-4" aria-hidden="true" />
+          </Button>
+        </div>
       </div>
 
-      <div className="flex items-center gap-1">
-        <Button
-          variant="ghost"
-          size="sm"
-          onClick={onRefresh}
-          aria-label="Refresh logs"
-          className={cn('h-8 gap-2 px-2 text-xs font-medium', FOCUS_RING)}
-        >
-          <RefreshCw
-            className={cn('h-3.5 w-3.5', isFetching && 'animate-spin')}
-            aria-hidden="true"
-          />
-          Refresh
-        </Button>
-        <Button
-          variant="ghost"
-          size="icon"
-          onClick={onOpenShortcuts}
-          aria-label="Show keyboard shortcuts"
-          title="Keyboard shortcuts (?)"
-          className={cn('h-8 w-8', FOCUS_RING)}
-        >
-          <HelpCircle className="h-4 w-4" aria-hidden="true" />
-        </Button>
-        <Button
-          variant="ghost"
-          size="icon"
-          onClick={onOpenSettings}
-          aria-label="Open logging settings"
-          className={cn('h-8 w-8', FOCUS_RING)}
-        >
-          <Settings className="h-4 w-4" aria-hidden="true" />
-        </Button>
+      {/* Stat strip — visual unity with home page's `LIVE Account Monitor`. */}
+      <div className="flex items-center gap-6 border-t border-border/60 bg-muted/20 px-4 py-2">
+        <Stat label="Entries" value={capturedCount} fallback={`${capturedCount}`} />
+        {stats ? (
+          <>
+            <Stat label="Traces" value={stats.traces} fallback={`${stats.traces}`} />
+            <Stat
+              label="Errors"
+              value={stats.errors}
+              fallback={`${stats.errors}`}
+              tone={stats.errors > 0 ? 'error' : 'neutral'}
+            />
+          </>
+        ) : null}
       </div>
     </div>
   );
 }
+
+interface StatProps {
+  label: string;
+  value: number;
+  fallback: string;
+  tone?: 'neutral' | 'error';
+}
+
+function Stat({ label, value, fallback, tone = 'neutral' }: StatProps) {
+  return (
+    <div className="flex items-baseline gap-2">
+      <span className="text-[10px] font-mono uppercase tracking-[0.14em] text-muted-foreground">
+        {label}
+      </span>
+      <span
+        className={cn(
+          'text-[14px] font-semibold tabular-nums',
+          tone === 'error' ? 'text-red-600 dark:text-red-400' : 'text-foreground',
+          MONO_NUMERIC
+        )}
+        title={String(value)}
+      >
+        {fallback}
+      </span>
+    </div>
+  );
+}
diff --git a/ui/src/components/logs/logs-row.tsx b/ui/src/components/logs/logs-row.tsx
index 8889fe43..c6675c39 100644
--- a/ui/src/components/logs/logs-row.tsx
+++ b/ui/src/components/logs/logs-row.tsx
@@ -1,8 +1,10 @@
-import { memo } from 'react';
+import { memo, useState, type KeyboardEvent, type MouseEvent } from 'react';
+import { Copy } from 'lucide-react';
 import type { LogsEntry } from '@/lib/api-client';
 import { cn } from '@/lib/utils';
 import { LogLevelBadge } from './log-level-badge';
 import { FOCUS_RING, MONO_NUMERIC, ROW_DENSITY, ROW_INTERACTIVE, type RowDensity } from './tokens';
+import { getDisplayLatency, getDisplayModule, getDisplayRequestId } from './utils';
 
 export interface LogsRowProps {
   entry: LogsEntry;
@@ -14,6 +16,8 @@ export interface LogsRowProps {
   indent?: number;
   /** Optional stage chip text (e.g. for child rows of a trace). */
   stageHint?: string;
+  /** Optional repeat counter — when the row coalesces N identical consecutive entries. */
+  repeatCount?: number;
 }
 
 function formatHms(timestamp: string): string {
@@ -27,6 +31,17 @@ function formatHms(timestamp: string): string {
   });
 }
 
+async function copyText(text: string): Promise<boolean> {
+  try {
+    await navigator.clipboard.writeText(text);
+    return true;
+  } catch {
+    // Insecure context or clipboard permission denied. Caller should NOT
+    // claim success in the UI when this returns false.
+    return false;
+  }
+}
+
 function LogsRowImpl({
   entry,
   isSelected,
@@ -35,68 +50,133 @@ function LogsRowImpl({
   onSelect,
   indent = 0,
   stageHint,
+  repeatCount,
 }: LogsRowProps) {
+  const [justCopied, setJustCopied] = useState(false);
+  const moduleLabel = getDisplayModule(entry, sourceLabel);
+  const latencyLabel = getDisplayLatency(entry);
+  const shortRequestId = getDisplayRequestId(entry, { short: true });
+
+  const handleSelect = () => onSelect(entry.id);
+  const handleKey = (e: KeyboardEvent<HTMLDivElement>) => {
+    // Ignore keys that bubbled from a nested interactive element (e.g. the
+    // copy-requestId button). Without this guard, pressing Enter on the
+    // copy button would also select the row and shift the detail panel.
+    if (e.target !== e.currentTarget) return;
+    if (e.key === 'Enter' || e.key === ' ') {
+      e.preventDefault();
+      handleSelect();
+    }
+  };
+
+  const handleCopyRequestId = async (e: MouseEvent) => {
+    e.stopPropagation();
+    if (!entry.requestId) return;
+    const ok = await copyText(entry.requestId);
+    if (!ok) return;
+    setJustCopied(true);
+    window.setTimeout(() => setJustCopied(false), 1200);
+  };
+
+  // Row is a focusable div (not a button) so it can host a real <button>
+  // for the copy-requestId affordance — nesting interactive elements
+  // inside a <button> is invalid HTML and breaks keyboard focus order.
   return (
-    <button
-      type="button"
+    <div
       role="row"
+      tabIndex={0}
       aria-selected={isSelected}
       data-selected={isSelected}
-      onClick={() => onSelect(entry.id)}
+      onClick={handleSelect}
+      onKeyDown={handleKey}
       style={{ paddingLeft: 12 + indent }}
       className={cn(
-        'flex w-full items-center gap-3 border-b border-border/50 pr-3 text-left',
+        'group flex w-full cursor-pointer items-center gap-3 border-b border-border/50 pr-3 text-left',
         ROW_DENSITY[density],
         ROW_INTERACTIVE,
         FOCUS_RING,
         isSelected && 'bg-muted/60 shadow-[inset_2px_0_0_var(--ring)]'
       )}
     >
+      {/* Leading 16px slot mirrors the trace-row chevron column so leaf
+          rows align under the same column edges as trace rows. */}
+      <span className="w-4 shrink-0" aria-hidden="true" />
       <span
         role="cell"
-        className={cn('w-[88px] shrink-0 truncate text-[11px] text-muted-foreground', MONO_NUMERIC)}
+        className={cn('w-[88px] shrink-0 truncate text-[12px] text-muted-foreground', MONO_NUMERIC)}
       >
         {formatHms(entry.timestamp)}
       </span>
       <span role="cell" className="flex w-[64px] shrink-0 items-center">
         <LogLevelBadge level={entry.level} />
       </span>
+      {/* Always reserve the stage column so leaf, trace head, and trace
+          child rows all align under the same column edges in the header
+          grid template. Children with `stageHint` show a chip; rows
+          without one render an empty span at the same width. */}
       {stageHint ? (
         <span
           role="cell"
-          className="w-[72px] shrink-0 truncate rounded border border-border bg-muted/30 px-1.5 py-0.5 text-[10px] uppercase tracking-wide text-muted-foreground"
+          className="w-[72px] shrink-0 truncate rounded border border-border bg-muted/30 px-1.5 py-0.5 text-[11px] uppercase tracking-wide text-muted-foreground"
         >
           {stageHint}
         </span>
-      ) : null}
+      ) : (
+        <span role="cell" className="w-[72px] shrink-0" aria-hidden="true" />
+      )}
       <span
         role="cell"
-        className="w-[140px] shrink-0 truncate text-[11px] font-medium text-foreground/80"
+        className="w-[140px] shrink-0 truncate text-[12px] font-medium text-foreground/80"
       >
-        {entry.module ?? sourceLabel}
+        {moduleLabel}
       </span>
-      <span role="cell" className="min-w-0 flex-1 truncate text-foreground/90">
+      <span role="cell" className="min-w-0 flex-1 truncate text-[13px] text-foreground/90">
         {entry.message}
+        {repeatCount && repeatCount > 1 ? (
+          <span
+            className="ml-2 inline-flex items-center rounded bg-muted px-1.5 py-0.5 text-[11px] font-medium text-muted-foreground"
+            title={`${repeatCount} consecutive identical entries`}
+          >
+            ×{repeatCount}
+          </span>
+        ) : null}
       </span>
       <span
         role="cell"
         className={cn(
-          'hidden w-[72px] shrink-0 truncate text-right text-[11px] text-muted-foreground sm:inline-block',
+          'hidden w-[72px] shrink-0 truncate text-right text-[12px] text-muted-foreground sm:inline-block',
           MONO_NUMERIC
         )}
       >
-        {entry.latencyMs !== undefined && entry.latencyMs !== null ? `${entry.latencyMs}ms` : ''}
+        {latencyLabel === '—' ? '' : latencyLabel}
       </span>
       <span
         role="cell"
         className={cn(
-          'hidden w-[88px] shrink-0 truncate text-right text-[11px] text-muted-foreground/80 lg:inline-block',
+          'hidden w-[112px] shrink-0 items-center justify-end gap-1 text-right text-[12px] text-muted-foreground/80 lg:inline-flex',
           MONO_NUMERIC
         )}
       >
-        {entry.requestId ? entry.requestId.slice(-8) : ''}
+        {entry.requestId ? (
+          <>
+            <span className="truncate">{shortRequestId}</span>
+            <button
+              type="button"
+              aria-label={justCopied ? 'Copied requestId' : 'Copy requestId'}
+              title={justCopied ? 'Copied' : 'Copy requestId'}
+              onClick={handleCopyRequestId}
+              className={cn(
+                'inline-flex h-5 w-5 shrink-0 items-center justify-center rounded text-muted-foreground/50 opacity-0 transition-opacity hover:bg-muted hover:text-foreground focus-visible:opacity-100 group-hover:opacity-100',
+                FOCUS_RING,
+                justCopied && 'text-emerald-600 opacity-100'
+              )}
+            >
+              <Copy className="h-3 w-3" aria-hidden="true" />
+            </button>
+          </>
+        ) : null}
       </span>
-    </button>
+    </div>
   );
 }
 
@@ -107,6 +187,7 @@ export const LogsRow = memo(LogsRowImpl, (prev, next) => {
     prev.density === next.density &&
     prev.indent === next.indent &&
     prev.stageHint === next.stageHint &&
-    prev.sourceLabel === next.sourceLabel
+    prev.sourceLabel === next.sourceLabel &&
+    prev.repeatCount === next.repeatCount
   );
 });
diff --git a/ui/src/components/logs/logs-shell.tsx b/ui/src/components/logs/logs-shell.tsx
index 2e985696..a659ee27 100644
--- a/ui/src/components/logs/logs-shell.tsx
+++ b/ui/src/components/logs/logs-shell.tsx
@@ -137,6 +137,18 @@ export function LogsShell({ workspace, updateConfig }: LogsShellProps) {
     [workspace.entriesQuery.data]
   );
 
+  // Derive header stat strip values once per data refetch.
+  const headerStats = useMemo(() => {
+    const data = workspace.entriesQuery.data ?? [];
+    const requestIds = new Set<string>();
+    let errors = 0;
+    for (const entry of data) {
+      if (entry.requestId) requestIds.add(entry.requestId);
+      if (entry.level === 'error') errors += 1;
+    }
+    return { entries: data.length, traces: requestIds.size, errors };
+  }, [workspace.entriesQuery.data]);
+
   const focusSearch = useCallback(() => {
     const input = document.getElementById('logs-search') as HTMLInputElement | null;
     if (input) {
@@ -180,6 +192,8 @@ export function LogsShell({ workspace, updateConfig }: LogsShellProps) {
       onRequestIdChange={workspace.setRequestIdFilter}
       timeWindow={workspace.timeWindow}
       onTimeWindowChange={workspace.setTimeWindow}
+      hideDashboardInternals={workspace.hideDashboardInternals}
+      onHideDashboardInternalsChange={workspace.setHideDashboardInternals}
       onClearAll={workspace.clearAdvancedFilters}
     />
   );
@@ -228,6 +242,7 @@ export function LogsShell({ workspace, updateConfig }: LogsShellProps) {
         isFetching={workspace.entriesQuery.isFetching || workspace.sourcesQuery.isFetching}
         hasError={Boolean(workspace.entriesQuery.error)}
         capturedCount={workspace.entriesQuery.data?.length ?? 0}
+        stats={headerStats}
         onRefresh={handleRefresh}
         onOpenSettings={openSettings}
         onOpenShortcuts={() => setShortcutsOpen(true)}
diff --git a/ui/src/components/logs/logs-trace-row.tsx b/ui/src/components/logs/logs-trace-row.tsx
index a0efee60..a6f14bf9 100644
--- a/ui/src/components/logs/logs-trace-row.tsx
+++ b/ui/src/components/logs/logs-trace-row.tsx
@@ -2,6 +2,7 @@ import { memo } from 'react';
 import { ChevronDown, ChevronRight, GitBranch } from 'lucide-react';
 import type { LogsEntry, LogsLevel } from '@/lib/api-client';
 import { cn } from '@/lib/utils';
+import { deriveStageHint } from './derive-trace-groups';
 import { LogLevelBadge } from './log-level-badge';
 import { LogsRow } from './logs-row';
 import { FOCUS_RING, MONO_NUMERIC, ROW_DENSITY, ROW_INTERACTIVE, type RowDensity } from './tokens';
@@ -62,11 +63,14 @@ function LogsTraceRowImpl({
           FOCUS_RING
         )}
       >
-        <Chevron className="h-3.5 w-3.5 text-muted-foreground" aria-hidden="true" />
+        {/* Reserve the same 16px slot as leaf rows so all columns align. */}
+        <span className="flex w-4 shrink-0 items-center justify-center" aria-hidden="true">
+          <Chevron className="h-3.5 w-3.5 text-muted-foreground" />
+        </span>
         <span
           role="cell"
           className={cn(
-            'w-[88px] shrink-0 truncate text-[11px] text-muted-foreground',
+            'w-[88px] shrink-0 truncate text-[12px] text-muted-foreground',
             MONO_NUMERIC
           )}
         >
@@ -75,20 +79,22 @@ function LogsTraceRowImpl({
         <span role="cell" className="flex w-[64px] shrink-0 items-center">
           <LogLevelBadge level={group.maxLevel} />
         </span>
+        {/* Empty stage column for grid alignment with header + leaf rows. */}
+        <span role="cell" className="w-[72px] shrink-0" aria-hidden="true" />
         <span
           role="cell"
-          className="flex w-[140px] shrink-0 items-center gap-1.5 truncate text-[11px] font-medium text-foreground/80"
+          className="flex w-[140px] shrink-0 items-center gap-1.5 truncate text-[12px] font-medium text-foreground/80"
         >
           <GitBranch className="h-3 w-3 text-muted-foreground" aria-hidden="true" />
           {group.module}
         </span>
-        <span role="cell" className="min-w-0 flex-1 truncate text-foreground/90">
+        <span role="cell" className="min-w-0 flex-1 truncate text-[13px] text-foreground/90">
           <span className="text-muted-foreground">trace · {group.children.length} stages</span>
         </span>
         <span
           role="cell"
           className={cn(
-            'hidden w-[72px] shrink-0 truncate text-right text-[11px] text-muted-foreground sm:inline-block',
+            'hidden w-[72px] shrink-0 truncate text-right text-[12px] text-muted-foreground sm:inline-block',
             MONO_NUMERIC
           )}
         >
@@ -97,13 +103,20 @@ function LogsTraceRowImpl({
         <span
           role="cell"
           className={cn(
-            'hidden w-[88px] shrink-0 truncate text-right text-[11px] text-muted-foreground lg:inline-block',
+            'hidden w-[112px] shrink-0 truncate text-right text-[12px] text-muted-foreground lg:inline-block',
             MONO_NUMERIC
           )}
         >
           {group.requestId.slice(-8)}
         </span>
       </button>
+      {/* Children render unconditionally — every stage is preserved so
+          retries, duplicated stage logs, and multi-attempt traces stay
+          individually inspectable. The user-facing noise problem this
+          PR addresses lives at the standalone-leaf level (dashboard
+          self-polling spam) where leaf-coalesce in deriveTraceGroups
+          handles it; opting in to see internals is a deliberate debug
+          choice, so collapsing trace stages there would hide intent. */}
       {isExpanded
         ? group.children.map((child) => (
             <LogsRow
@@ -114,7 +127,7 @@ function LogsTraceRowImpl({
               sourceLabel={sourceLabel}
               onSelect={onSelect}
               indent={20}
-              stageHint={child.stage}
+              stageHint={deriveStageHint(child)}
             />
           ))
         : null}
diff --git a/ui/src/components/logs/utils.ts b/ui/src/components/logs/utils.ts
index 90de8d1b..1c77dbf3 100644
--- a/ui/src/components/logs/utils.ts
+++ b/ui/src/components/logs/utils.ts
@@ -1,4 +1,4 @@
-import type { LogsLevel } from '@/lib/api-client';
+import type { LogsEntry, LogsLevel } from '@/lib/api-client';
 // NOTE: This module contains utility functions that are not directly i18n-aware.
 // String literals here ("No activity yet", "Error", etc.) are used as fallbacks
 // and defaults in non-component contexts. Components consuming these values
@@ -80,3 +80,37 @@ export function getLevelLabel(level: LogsLevel) {
       return 'Debug';
   }
 }
+
+// Field accessors shared by list row + detail panel.
+// Without these, list and detail diverged — list fell back to source/sourceLabel
+// while detail showed `—` for the same entry. Single source of truth.
+
+export function getDisplayModule(entry: LogsEntry, sourceLabel?: string): string {
+  return entry.module ?? sourceLabel ?? entry.source ?? '—';
+}
+
+export function getDisplayStage(entry: LogsEntry): string {
+  return entry.stage ?? '—';
+}
+
+export function getDisplayRequestId(entry: LogsEntry, options: { short?: boolean } = {}): string {
+  if (!entry.requestId) return '—';
+  return options.short ? entry.requestId.slice(-8) : entry.requestId;
+}
+
+export function getDisplayLatency(entry: LogsEntry): string {
+  if (entry.latencyMs === undefined || entry.latencyMs === null) return '—';
+  return `${entry.latencyMs}ms`;
+}
+
+/**
+ * Default filter pattern: dashboard self-polling sources start with `web-server:`.
+ * UI applies as a default exclusion to keep the logs view focused on signal,
+ * not the dashboard observing itself.
+ */
+export const DASHBOARD_INTERNALS_PATTERN = /^web-server:/i;
+
+export function isDashboardInternal(entry: LogsEntry): boolean {
+  if (!entry.source) return false;
+  return DASHBOARD_INTERNALS_PATTERN.test(entry.source);
+}
diff --git a/ui/src/hooks/use-logs.ts b/ui/src/hooks/use-logs.ts
index 254b9285..702db1f6 100644
--- a/ui/src/hooks/use-logs.ts
+++ b/ui/src/hooks/use-logs.ts
@@ -116,6 +116,10 @@ export function useLogsWorkspace() {
   const [limit, setLimit] = useState(DEFAULT_LIMIT);
   const [selectedEntryId, setSelectedEntryId] = useState<string | null>(null);
   const [isPaused, setIsPaused] = useState(false);
+  // Default ON: dashboard self-polling generates 100s of identical entries
+  // per refresh which drown out real provider activity. Users can opt in to
+  // see internals via the advanced filter toggle.
+  const [hideDashboardInternals, setHideDashboardInternals] = useState(true);
   const frozenIdsRef = useRef<Set<string>>(new Set());
 
   const deferredSearch = useDeferredValue(search.trim());
@@ -151,6 +155,7 @@ export function useLogsWorkspace() {
       debouncedRequestId,
       timeWindow,
       limit,
+      hideDashboardInternals ? 'hide-internals' : 'show-internals',
       mockEnabled ? 'mock' : 'live',
     ],
     queryFn: async () => {
@@ -191,6 +196,9 @@ export function useLogsWorkspace() {
           const ts = Date.parse(entry.timestamp);
           if (Number.isFinite(ts) && now - ts > cutoffMs) return false;
         }
+        // Hide dashboard self-polling unless user opted in. Preserves the
+        // signal-to-noise ratio for fresh-load investigations.
+        if (hideDashboardInternals && /^web-server:/i.test(entry.source)) return false;
         return true;
       });
       const head = filtered[0];
@@ -265,6 +273,7 @@ export function useLogsWorkspace() {
     setStageFilter('');
     setRequestIdFilter('');
     setTimeWindow('all');
+    setHideDashboardInternals(true);
   }, []);
 
   return {
@@ -285,6 +294,8 @@ export function useLogsWorkspace() {
     setRequestIdFilter,
     timeWindow,
     setTimeWindow,
+    hideDashboardInternals,
+    setHideDashboardInternals,
     limit,
     setLimit,
     selectedEntryId: activeSelectedEntryId,
diff --git a/ui/tests/unit/ui/components/logs-derive-trace-groups.test.ts b/ui/tests/unit/ui/components/logs-derive-trace-groups.test.ts
new file mode 100644
index 00000000..1fef043f
--- /dev/null
+++ b/ui/tests/unit/ui/components/logs-derive-trace-groups.test.ts
@@ -0,0 +1,194 @@
+import { describe, expect, it } from 'vitest';
+import type { LogsEntry } from '@/lib/api-client';
+import {
+  deriveStageHint,
+  deriveTraceGroups,
+  type LeafItem,
+} from '@/components/logs/derive-trace-groups';
+import type { TraceGroup } from '@/components/logs/logs-trace-row';
+
+// Minimal LogsEntry factory — fields the helpers actually look at.
+function entry(overrides: Partial<LogsEntry> & Pick<LogsEntry, 'id' | 'timestamp'>): LogsEntry {
+  return {
+    level: 'info',
+    source: 'web-server:http',
+    event: 'event.default',
+    message: 'default message',
+    ...overrides,
+  } as LogsEntry;
+}
+
+function leafEntries(
+  ...overrides: Array<Partial<LogsEntry> & Pick<LogsEntry, 'id' | 'timestamp'>>
+) {
+  return overrides.map(entry);
+}
+
+describe('deriveStageHint', () => {
+  it('returns explicit stage when present', () => {
+    expect(deriveStageHint(entry({ id: '1', timestamp: 't', stage: 'route' }))).toBe('route');
+  });
+
+  it('falls back to last `.`-segment of event when stage is missing', () => {
+    expect(deriveStageHint(entry({ id: '1', timestamp: 't', event: 'request.dispatched' }))).toBe(
+      'dispatched'
+    );
+  });
+
+  it('caps the derived hint at 12 chars', () => {
+    expect(
+      deriveStageHint(entry({ id: '1', timestamp: 't', event: 'foo.absurdlylongsegmentname' }))
+    ).toBe('absurdlylong');
+  });
+
+  it('returns undefined when neither stage nor event is meaningful', () => {
+    expect(deriveStageHint(entry({ id: '1', timestamp: 't', event: '' }))).toBeUndefined();
+  });
+
+  it('treats single-segment event as its own hint', () => {
+    expect(deriveStageHint(entry({ id: '1', timestamp: 't', event: 'startup' }))).toBe('startup');
+  });
+});
+
+describe('deriveTraceGroups', () => {
+  it('returns empty array for empty input', () => {
+    expect(deriveTraceGroups([])).toEqual([]);
+  });
+
+  it('emits a single leaf for a no-requestId entry', () => {
+    const e = entry({ id: '1', timestamp: '2026-01-01T00:00:00Z' });
+    const result = deriveTraceGroups([e]);
+    expect(result).toHaveLength(1);
+    expect(result[0]?.kind).toBe('leaf');
+    expect((result[0] as LeafItem).entry).toBe(e);
+    expect((result[0] as LeafItem).repeatCount).toBeUndefined();
+  });
+
+  it('groups entries sharing a requestId into one trace', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: '2026-01-01T00:00:01Z', requestId: 'req-1', stage: 'intake' },
+        { id: '2', timestamp: '2026-01-01T00:00:02Z', requestId: 'req-1', stage: 'route' }
+      )
+    );
+    expect(result).toHaveLength(1);
+    expect(result[0]?.kind).toBe('trace');
+    expect((result[0] as TraceGroup).children).toHaveLength(2);
+  });
+
+  it('sorts trace children by ts ascending and pins group ts to oldest child', () => {
+    // Input order intentionally reverses ts so we can assert the sort.
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '2', timestamp: '2026-01-01T00:00:02Z', requestId: 'req-1' },
+        { id: '1', timestamp: '2026-01-01T00:00:01Z', requestId: 'req-1' }
+      )
+    );
+    const trace = result[0] as TraceGroup;
+    expect(trace.children.map((c) => c.id)).toEqual(['1', '2']);
+    expect(trace.ts).toBe('2026-01-01T00:00:01Z');
+  });
+
+  it('coalesces two adjacent identical leaves into a single ×N row', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', event: 'poll', message: 'tick' },
+        { id: '2', timestamp: 't2', event: 'poll', message: 'tick' }
+      )
+    );
+    expect(result).toHaveLength(1);
+    const leaf = result[0] as LeafItem;
+    expect(leaf.repeatCount).toBe(2);
+    expect(leaf.collapsedRange?.fromTs).toBe('t1');
+    expect(leaf.collapsedRange?.toTs).toBe('t2');
+  });
+
+  it('does NOT coalesce identical leaves split by an unrelated trace (round-3 fix)', () => {
+    // Two identical no-requestId entries with a trace between them: the run
+    // must break — they were not adjacent in the real stream.
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', event: 'poll', message: 'tick' },
+        { id: '2', timestamp: 't2', requestId: 'req-1' },
+        { id: '3', timestamp: 't3', event: 'poll', message: 'tick' }
+      )
+    );
+    // Expected: 1 trace + 2 distinct leaves (no ×N).
+    const leaves = result.filter((r) => r.kind === 'leaf') as LeafItem[];
+    expect(leaves).toHaveLength(2);
+    expect(leaves.every((l) => l.repeatCount === undefined)).toBe(true);
+  });
+
+  it('keeps adjacent leaves with different stages as separate rows (round-6 fix)', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', event: 'e', message: 'm', stage: 'route' },
+        { id: '2', timestamp: 't2', event: 'e', message: 'm', stage: 'dispatch' }
+      )
+    );
+    expect(result).toHaveLength(2);
+    expect(result.every((r) => r.kind === 'leaf' && r.repeatCount === undefined)).toBe(true);
+  });
+
+  it('keeps adjacent leaves with different messages as separate rows', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', event: 'login', message: 'alice' },
+        { id: '2', timestamp: 't2', event: 'login', message: 'bob' }
+      )
+    );
+    expect(result).toHaveLength(2);
+    expect(result.every((r) => r.kind === 'leaf' && r.repeatCount === undefined)).toBe(true);
+  });
+
+  it('display-sorts items reverse-chronologically', () => {
+    // Use distinct events so leaves don't coalesce — testing display sort,
+    // not coalesce.
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: '2026-01-01T00:00:01Z', event: 'a' },
+        { id: '2', timestamp: '2026-01-01T00:00:03Z', event: 'b' },
+        { id: '3', timestamp: '2026-01-01T00:00:02Z', event: 'c' }
+      )
+    );
+    const ids = result.map((r) => (r.kind === 'leaf' ? r.entry.id : 'trace'));
+    expect(ids).toEqual(['2', '3', '1']);
+  });
+
+  it('computes max level across trace children', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', requestId: 'r', level: 'debug' },
+        { id: '2', timestamp: 't2', requestId: 'r', level: 'error' },
+        { id: '3', timestamp: 't3', requestId: 'r', level: 'info' }
+      )
+    );
+    expect((result[0] as TraceGroup).maxLevel).toBe('error');
+  });
+
+  it('sums latencyMs across trace children', () => {
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: 't1', requestId: 'r', latencyMs: 100 },
+        { id: '2', timestamp: 't2', requestId: 'r', latencyMs: 50 },
+        { id: '3', timestamp: 't3', requestId: 'r' /* no latency */ }
+      )
+    );
+    expect((result[0] as TraceGroup).totalLatencyMs).toBe(150);
+  });
+
+  it('preserves original input order when computing leaf adjacency, even if display sort reorders later', () => {
+    // Stream: [A, B, A] — A entries identical but split by B. A run of 1+1+1.
+    const result = deriveTraceGroups(
+      leafEntries(
+        { id: '1', timestamp: '2026-01-01T00:00:01Z', event: 'A' },
+        { id: '2', timestamp: '2026-01-01T00:00:02Z', event: 'B' },
+        { id: '3', timestamp: '2026-01-01T00:00:03Z', event: 'A' }
+      )
+    );
+    const leaves = result.filter((r) => r.kind === 'leaf') as LeafItem[];
+    expect(leaves).toHaveLength(3);
+    // None should have repeatCount because A and A weren't adjacent.
+    expect(leaves.every((l) => l.repeatCount === undefined)).toBe(true);
+  });
+});