feat: add Terminal Dashboard components and state management

- Implement TerminalTabBar for session tab management with status indicators and alert badges.
- Create TerminalWorkbench to combine TerminalTabBar and TerminalInstance for terminal session display.
- Add localization support for terminal dashboard in English and Chinese.
- Develop TerminalDashboardPage for the main layout of the terminal dashboard with a three-column structure.
- Introduce Zustand stores for session management and issue/queue integration, handling session groups, terminal metadata, and alert management.
- Create a monitor web worker for off-main-thread output analysis, detecting errors and stalls in terminal sessions.
- Define TypeScript types for terminal dashboard state management and integration.

ccw/frontend/src/locales/en/index.ts

@@ -39,6 +39,7 @@ import workspace from './workspace.json';
 import help from './help.json';
 import cliViewer from './cli-viewer.json';
 import team from './team.json';
+import terminalDashboard from './terminal-dashboard.json';
 
 /**
  * Flattens nested JSON object to dot-separated keys
@@ -101,4 +102,5 @@ export default {
   ...flattenMessages(help, 'help'),
   ...flattenMessages(cliViewer, 'cliViewer'),
   ...flattenMessages(team, 'team'),
+  ...flattenMessages(terminalDashboard, 'terminalDashboard'),
 } as Record<string, string>;

ccw/frontend/src/locales/en/navigation.json

@@ -35,7 +35,8 @@
     "rules": "Rules",
     "explorer": "File Explorer",
     "graph": "Graph Explorer",
-    "teams": "Team Execution"
+    "teams": "Team Execution",
+    "terminalDashboard": "Terminal Dashboard"
   },
   "sidebar": {
     "collapse": "Collapse",

ccw/frontend/src/locales/en/terminal-dashboard.json

@@ -0,0 +1,81 @@
+{
+  "page": {
+    "title": "Terminal Dashboard"
+  },
+  "columns": {
+    "sessions": "Sessions",
+    "workflow": "Workflow",
+    "terminal": "Terminal Workbench"
+  },
+  "kpi": {
+    "title": "Dashboard KPI",
+    "activeSessions": "Active Sessions",
+    "queueSize": "Queue Size",
+    "alertCount": "Alerts",
+    "errorCount": "Errors",
+    "idleCount": "Idle"
+  },
+  "inspector": {
+    "title": "Inspector",
+    "noSelection": "Select an item to view details",
+    "associationChain": "Association Chain"
+  },
+  "sessionTree": {
+    "createGroup": "New Group",
+    "groupNamePrompt": "Enter group name",
+    "defaultGroupName": "Untitled Group",
+    "emptyGroup": "No sessions in this group",
+    "noGroups": "No session groups yet",
+    "sessionCount": "{count} sessions",
+    "dragHint": "Drag sessions between groups"
+  },
+  "agentList": {
+    "title": "Agents",
+    "noAgents": "No active agents",
+    "stepLabel": "Step {current}/{total}",
+    "statusRunning": "Running",
+    "statusCompleted": "Completed",
+    "statusFailed": "Failed",
+    "statusPaused": "Paused",
+    "statusPending": "Pending"
+  },
+  "issuePanel": {
+    "title": "Issues",
+    "sendToQueue": "Send to Queue",
+    "noIssues": "No issues found",
+    "noIssuesDesc": "Issues will appear here when discovered",
+    "error": "Failed to load issues"
+  },
+  "queuePanel": {
+    "title": "Queue",
+    "noItems": "Queue is empty",
+    "noItemsDesc": "Send issues to queue to start workflow",
+    "error": "Failed to load queue",
+    "order": "#{order}",
+    "dependsOn": "Depends on: {deps}",
+    "status": {
+      "pending": "Pending",
+      "ready": "Ready",
+      "executing": "Executing",
+      "completed": "Completed",
+      "failed": "Failed",
+      "blocked": "Blocked"
+    }
+  },
+  "tabBar": {
+    "noTabs": "No terminal sessions"
+  },
+  "workbench": {
+    "noTerminal": "No terminal selected",
+    "noTerminalHint": "Select a session from the tab bar or create a new one"
+  },
+  "placeholder": {
+    "sessionTree": "Session groups will appear here",
+    "agentList": "Agent list will appear here",
+    "issuePanel": "Issue panel will appear here",
+    "queuePanel": "Queue panel will appear here",
+    "terminalWorkbench": "Terminal workbench will appear here",
+    "kpiBar": "KPI metrics will appear here",
+    "inspector": "Inspector details will appear here"
+  }
+}