feat(studio): show DD/MM HH:mm · target · pass% run label with time-ago

apps/studio/src/components/Sidebar.tsx

@@ -29,7 +29,7 @@ import {
   useRunList,
   useStudioConfig,
 } from '~/lib/api';
-import { formatRunLabel } from '~/lib/run-label';
+import { formatRunLabel, timeAgo } from '~/lib/run-label';
 import { useSidebarContext } from '~/lib/sidebar-context';
 
 /** Responsive <aside> wrapper. Handles mobile overlay and desktop static placement. */
@@ -211,10 +211,11 @@ function RunSidebar() {
                 key={`${run.benchmark_id}/${run.filename}`}
                 to="/benchmarks/$benchmarkId/runs/$runId"
                 params={{ benchmarkId: run.benchmark_id, runId: run.filename }}
-                className="mb-0.5 block truncate rounded-md px-2 py-1.5 text-sm text-gray-400 transition-colors hover:bg-gray-800/50 hover:text-gray-200"
+                className="mb-0.5 block rounded-md px-2 py-1.5 text-sm text-gray-400 transition-colors hover:bg-gray-800/50 hover:text-gray-200"
                 title={run.benchmark_name}
               >
-                {formatRunLabel(run)}
+                <span className="block truncate">{formatRunLabel(run)}</span>
+                <span className="block text-xs text-gray-600">{timeAgo(run.timestamp)}</span>
               </Link>
             );
           }
@@ -224,13 +225,14 @@ function RunSidebar() {
               key={run.filename}
               to="/runs/$runId"
               params={{ runId: run.filename }}
-              className={`mb-0.5 block truncate rounded-md px-2 py-1.5 text-sm transition-colors ${
+              className={`mb-0.5 block rounded-md px-2 py-1.5 text-sm transition-colors ${
                 isActive
                   ? 'bg-gray-800 text-cyan-400'
                   : 'text-gray-400 hover:bg-gray-800/50 hover:text-gray-200'
               }`}
             >
-              {formatRunLabel(run)}
+              <span className="block truncate">{formatRunLabel(run)}</span>
+              <span className="block text-xs text-gray-600">{timeAgo(run.timestamp)}</span>
             </Link>
           );
         })}
@@ -446,13 +448,14 @@ function BenchmarkRunDetailSidebar({
               key={run.filename}
               to="/benchmarks/$benchmarkId/runs/$runId"
               params={{ benchmarkId, runId: run.filename }}
-              className={`mb-0.5 block truncate rounded-md px-2 py-1.5 text-sm transition-colors ${
+              className={`mb-0.5 block rounded-md px-2 py-1.5 text-sm transition-colors ${
                 isActive
                   ? 'bg-gray-800 text-cyan-400'
                   : 'text-gray-400 hover:bg-gray-800/50 hover:text-gray-200'
               }`}
             >
-              {formatRunLabel(run)}
+              <span className="block truncate">{formatRunLabel(run)}</span>
+              <span className="block text-xs text-gray-600">{timeAgo(run.timestamp)}</span>
             </Link>
           );
         })}

apps/studio/src/lib/run-label.test.ts

@@ -3,23 +3,34 @@ import { describe, expect, it } from 'bun:test';
 import { formatRunLabel } from './run-label';
 
 describe('formatRunLabel', () => {
-  it('prefers target and experiment over the timestamp display name', () => {
+  it('shows DD/MM HH:mm · target · experiment · score', () => {
     expect(
       formatRunLabel({
-        filename: 'issue-1198::2026-04-29T09-17-30-111Z',
-        display_name: '2026-04-29T09-17-30-111Z',
         target: 'llm-dry-run',
         experiment: 'issue-1198',
+        timestamp: '2026-04-29T09:17:30.111Z',
+        pass_rate: 0.8,
       }),
-    ).toBe('llm-dry-run · issue-1198');
+    ).toBe('29/04 09:17 · llm-dry-run · issue-1198 · 80%');
   });
 
-  it('falls back to the display name when no richer metadata is available', () => {
+  it('omits experiment when it is the default', () => {
     expect(
       formatRunLabel({
-        filename: '2026-04-29T09-17-30-111Z',
-        display_name: '2026-04-29T09-17-30-111Z',
+        target: 'azure',
+        experiment: 'default',
+        timestamp: '2026-04-29T09:17:30.111Z',
+        pass_rate: 1,
       }),
-    ).toBe('2026-04-29T09-17-30-111Z');
+    ).toBe('29/04 09:17 · azure · 100%');
+  });
+
+  it('shows just timestamp and score when no target is present', () => {
+    expect(
+      formatRunLabel({
+        timestamp: '2026-04-29T09:17:30.111Z',
+        pass_rate: 0,
+      }),
+    ).toBe('29/04 09:17 · 0%');
   });
 });

apps/studio/src/lib/run-label.ts

@@ -1,14 +1,48 @@
 import type { RunMeta } from './types';
 
-type RunLabelInput = Pick<RunMeta, 'display_name' | 'experiment' | 'filename' | 'target'>;
+type RunLabelInput = Pick<RunMeta, 'experiment' | 'target' | 'timestamp' | 'pass_rate'>;
+
+/** DD/MM HH:mm — short human-readable slice of the run's timestamp. */
+function shortTimestamp(ts: string): string {
+  try {
+    const d = new Date(ts);
+    if (Number.isNaN(d.getTime())) return ts.slice(0, 10);
+    const dd = String(d.getDate()).padStart(2, '0');
+    const mm = String(d.getMonth() + 1).padStart(2, '0');
+    const hh = String(d.getHours()).padStart(2, '0');
+    const min = String(d.getMinutes()).padStart(2, '0');
+    return `${dd}/${mm} ${hh}:${min}`;
+  } catch {
+    return ts.slice(0, 10);
+  }
+}
+
+/** Human-readable relative time string, e.g. "4 hr ago". */
+export function timeAgo(ts: string): string {
+  try {
+    const diffMs = Date.now() - new Date(ts).getTime();
+    const diffMin = Math.floor(diffMs / 60_000);
+    if (diffMin < 1) return 'just now';
+    if (diffMin < 60) return `${diffMin} min ago`;
+    const diffHour = Math.floor(diffMs / 3_600_000);
+    if (diffHour < 24) return `${diffHour} hr ago`;
+    const diffDay = Math.floor(diffMs / 86_400_000);
+    return `${diffDay} day${diffDay === 1 ? '' : 's'} ago`;
+  } catch {
+    return '';
+  }
+}
 
 /** Format a run label consistently across tables and nav surfaces. */
 export function formatRunLabel(run: RunLabelInput): string {
-  const parts = [run.target, run.experiment].filter(
-    (part): part is string => !!part && part !== 'default' && part !== '-',
-  );
-  if (parts.length > 0) {
-    return parts.join(' · ');
+  const parts: string[] = [shortTimestamp(run.timestamp)];
+
+  if (run.target) parts.push(run.target);
+  if (run.experiment && run.experiment !== 'default' && run.experiment !== '-') {
+    parts.push(run.experiment);
   }
-  return run.display_name ?? run.filename;
+
+  parts.push(`${Math.round(run.pass_rate * 100)}%`);
+
+  return parts.join(' · ');
 }