feat(ui): align logs page visual language with dashboard markers

Logs page was visually disconnected from the rest of the dashboard. Health
uses ornamental `HEALTH.ATTENTIONREQUIRED` markers, Home uses `LIVE
Account Monitor` + stat cards. Logs shipped with a 14px h1 + clinical
table that felt like a different product.

- Header now opens with a `LOGS.STREAM` mono-uppercase marker matching
  the dashboard's `HEALTH.X` style, plus a 16px "Live activity" title
  and a status pill.
- Below the header, a stat strip mirrors the home page's monitor layout:
  ENTRIES / TRACES / ERRORS counters, errors highlighted red when >0.
- Trace row + child row font sizes lifted from 11px to 12-13px;
  request-id column widened to 112px to match the standalone-row table.
- Stage-hint fallback derived from event names so the trace timeline
  still renders meaningful chips when backend entries lack an explicit
  `stage` field (e.g. dashboard self-polling).
- Intra-trace coalesce: identical consecutive child rows collapse to a
  single row with `× N` badge so a 149-stage self-poll trace renders as
  3 rows of signal instead of 149 rows of noise.

Refs #1138, #1141, #1142

ui/src/components/logs/derive-trace-groups.ts

@@ -6,10 +6,96 @@ 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;
 
+/**
+ * Tuple key for coalescing: two entries are "same enough" to collapse when
+ * (event, module, level, requestId, source) all match.
+ */
+function coalesceKey(entry: LogsEntry): string {
+  return [
+    entry.event ?? '',
+    entry.module ?? entry.source ?? '',
+    entry.level,
+    entry.requestId ?? '',
+    entry.source ?? '',
+  ].join(' ');
+}
+
+/**
+ * Coalesce a list of entries: any run of consecutive entries with identical
+ * `coalesceKey` collapses to a single leaf with `repeatCount` set.
+ *
+ * Conservative — only collapses *adjacent* duplicates. Mixing different
+ * events between repeats prevents collapsing on purpose: hiding interleaved
+ * signal would be worse than the noise.
+ */
+function coalesceLeaves(entries: LogsEntry[]): LeafItem[] {
+  if (entries.length === 0) return [];
+  const out: LeafItem[] = [];
+  let runHead: LogsEntry | null = null;
+  let runCount = 0;
+  let runFromTs = '';
+  let runToTs = '';
+  let runKey = '';
+
+  const flush = () => {
+    if (!runHead) return;
+    if (runCount === 1) {
+      out.push({ kind: 'leaf', entry: runHead });
+    } else {
+      out.push({
+        kind: 'leaf',
+        entry: runHead,
+        repeatCount: runCount,
+        collapsedRange: { fromTs: runFromTs, toTs: runToTs },
+      });
+    }
+    runHead = null;
+    runCount = 0;
+  };
+
+  for (const entry of entries) {
+    const key = coalesceKey(entry);
+    if (runHead && key === runKey) {
+      runCount += 1;
+      runToTs = entry.timestamp;
+    } else {
+      flush();
+      runHead = entry;
+      runCount = 1;
+      runFromTs = entry.timestamp;
+      runToTs = entry.timestamp;
+      runKey = key;
+    }
+  }
+  flush();
+  return out;
+}
+
+/**
+ * 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 flat list of either standalone leaves or trace groups
  * (entries sharing a `requestId`). Stable, single-pass, O(n).
@@ -17,20 +103,26 @@ export type DerivedItem = LeafItem | TraceGroup;
  * 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.
+ *
+ * Standalone leaves are coalesced: consecutive identical entries collapse
+ * into a single leaf with `repeatCount` so dashboard self-polling floods
+ * don't drown out real signal.
  */
 export function deriveTraceGroups(entries: LogsEntry[]): DerivedItem[] {
   const groups = new Map<string, LogsEntry[]>();
-  const leaves: LeafItem[] = [];
+  const rawLeaves: LogsEntry[] = [];
   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]);
     } else {
-      leaves.push({ kind: 'leaf', entry });
+      rawLeaves.push(entry);
     }
   }
 
+  const leaves = coalesceLeaves(rawLeaves);
+
   const groupItems: TraceGroup[] = [];
   for (const [requestId, children] of groups) {
     const sorted = [...children].sort((a, b) => a.timestamp.localeCompare(b.timestamp));

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>
+  );
+}

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';
@@ -38,6 +39,37 @@ function formatHms(timestamp: string): string {
   });
 }
 
+/**
+ * Coalesce identical consecutive children inside a single trace. Same key
+ * tuple as standalone-leaf coalescing — `(event, stage, level)` since all
+ * children share `requestId` already.
+ */
+function coalesceChildren(children: LogsEntry[]): Array<{ head: LogsEntry; count: number }> {
+  if (children.length === 0) return [];
+  const out: Array<{ head: LogsEntry; count: number }> = [];
+  let head: LogsEntry | null = null;
+  let count = 0;
+  let key = '';
+  const flush = () => {
+    if (head) out.push({ head, count });
+    head = null;
+    count = 0;
+  };
+  for (const child of children) {
+    const k = `${child.event ?? ''}|${child.stage ?? ''}|${child.level}|${child.module ?? ''}`;
+    if (head && k === key) {
+      count += 1;
+    } else {
+      flush();
+      head = child;
+      count = 1;
+      key = k;
+    }
+  }
+  flush();
+  return out;
+}
+
 function LogsTraceRowImpl({
   group,
   isExpanded,
@@ -66,7 +98,7 @@ function LogsTraceRowImpl({
         <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
           )}
         >
@@ -77,18 +109,18 @@ function LogsTraceRowImpl({
         </span>
         <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
           )}
         >
@@ -97,7 +129,7 @@ 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
           )}
         >
@@ -105,16 +137,17 @@ function LogsTraceRowImpl({
         </span>
       </button>
       {isExpanded
-        ? group.children.map((child) => (
+        ? coalesceChildren(group.children).map((run) => (
             <LogsRow
-              key={child.id}
-              entry={child}
-              isSelected={child.id === selectedEntryId}
+              key={run.head.id}
+              entry={run.head}
+              isSelected={run.head.id === selectedEntryId}
               density={density}
               sourceLabel={sourceLabel}
               onSelect={onSelect}
               indent={20}
-              stageHint={child.stage}
+              stageHint={deriveStageHint(run.head)}
+              repeatCount={run.count > 1 ? run.count : undefined}
             />
           ))
         : null}