feat(web-ui): add pinned sessions and live monitor in Chat (#118)

* feat: add single-page live session monitor and chat pinning

* fix: restore full test green after main merge

* fix: use Array.from instead of Set spread for ts-node compatibility

[...new Set()] requires downlevelIteration which isn't enabled in
ts-node dev mode, causing sonic-boom crash on startup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: ekko <fqsy1416@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/i18n/locales/en.ts

@@ -86,6 +86,17 @@ export default {
     deleteSession: 'Delete this session?',
     sessionDeleted: 'Session deleted',
     rename: 'Rename',
+    pin: 'Pin',
+    unpin: 'Unpin',
+    pinned: 'Pinned',
+    chatMode: 'Chat',
+    liveMode: 'Live',
+    liveSessions: 'Live Sessions',
+    recentBadge: 'Recent',
+    linkedSessions: '{count} linked',
+    noVisibleMessages: 'No human-visible messages.',
+    monitorRoleUser: 'User',
+    monitorRoleAssistant: 'Assistant',
     copySessionId: 'Copy Session ID',
     renamed: 'Renamed',
     renameFailed: 'Rename failed',
@@ -369,6 +380,10 @@ export default {
       idleMinutes: 'Idle Timeout',
       idleMinutesHint: 'Wait time before auto-reset (minutes)',
       atHour: 'Scheduled Reset Time',
+      humanOnly: 'Show human sessions only',
+      humanOnlyHint: 'Hide sub-agent/session monitor noise by default',
+      liveMonitorHumanOnly: 'Live monitor: show human sessions only',
+      liveMonitorHumanOnlyHint: 'Hide sub-agent/session monitor noise in the Live monitor by default',
       atHourHint: 'Reset session at this hour daily',
     },
     privacy: {