feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

client/src/i18n/locales/en/nav.json

@@ -0,0 +1,63 @@
+{
+  "activityFeed": "Activity Feed",
+  "agentBoard": "Kanban Board",
+  "analytics": "Analytics",
+  "avg": "avg",
+  "brand": "Agent Dashboard",
+  "brandSub": "Claude Code Monitor",
+  "ccConfig": "Claude Config",
+  "checkFailed": "Update check failed",
+  "checkForUpdates": "Check for updates",
+  "checkingForUpdates": "Checking for updates...",
+  "close": "Close",
+  "collapse": "Collapse sidebar",
+  "collapseShort": "Collapse",
+  "connection": "Connection",
+  "connectionDetails": "Connection details",
+  "connectionUptime": "Connected",
+  "dashboard": "Dashboard",
+  "daysAgo": "{{count}}d ago",
+  "disconnected": "Disconnected",
+  "eventsLastMin": "Last 60s",
+  "eventsReceived": "Events received",
+  "eventsTotal": "Total",
+  "expand": "Expand sidebar",
+  "hoursAgo": "{{count}}h ago",
+  "justNow": "just now",
+  "language": "Language",
+  "languageNames": {
+    "en": "English",
+    "vi": "Vietnamese"
+  },
+  "languageShort": {
+    "en": "EN",
+    "vi": "VI"
+  },
+  "lastEvent": "Last event",
+  "live": "Live",
+  "minutesAgo": "{{count}}m ago",
+  "noEventsYet": "No events yet",
+  "notConnected": "Not connected",
+  "notFound": "Not found",
+  "peakRate": "Peak",
+  "recentActivity": "Recent activity",
+  "resetStats": "Reset",
+  "scrollDown": "Scroll navigation down",
+  "scrollUp": "Scroll navigation up",
+  "secondsAgo": "{{count}}s ago",
+  "sessions": "Sessions",
+  "settings": "Settings",
+  "skipToContent": "Skip to content",
+  "statsPersisted": "Stats persist across reloads",
+  "switchLanguage": "Switch to {{language}}",
+  "throughput60s": "Throughput · last 60s",
+  "topEventTypes": "Top event types",
+  "unitEvents": "events",
+  "unitPerSec": "events/s",
+  "upToDate": "Up to date",
+  "updateAvailable": "Update available",
+  "website": "Website",
+  "workflows": "Workflows",
+  "workspace": "Workspace",
+  "wsEndpoint": "WebSocket"
+}