feat: Add Phase 6 for Post-Implementation Review and enhance workflow execution

- Introduced Phase 6: Post-Implementation Review with detailed steps for specialized reviews (quality, security, architecture, action items).
- Updated SKILL.md to reflect new phase and its execution lifecycle.
- Enhanced Flowchart component to conditionally display step statuses based on task tracking.
- Modified TaskDrawer to pass status tracking prop to Flowchart.
- Improved AgentList and other terminal dashboard components for better UI consistency and responsiveness.
- Removed GlobalKpiBar component as part of UI cleanup.
- Added issue detail preview in TerminalWorkbench for better user experience when no terminal is active.
- Updated localization files for new strings related to the terminal dashboard and workbench.
- Enhanced TaskListTab to conditionally render task stats and status dropdown based on task status tracking.

ccw/frontend/src/components/terminal-dashboard/QueuePanel.tsx

@@ -164,7 +164,7 @@ function QueueErrorState({ error }: { error: Error }) {
   return (
     <div className="flex-1 flex items-center justify-center text-destructive p-4">
       <div className="text-center">
-        <AlertTriangle className="h-10 w-10 mx-auto mb-3 opacity-60" />
+        <AlertTriangle className="h-6 w-6 mx-auto mb-1.5 opacity-30" />
         <p className="text-sm">{formatMessage({ id: 'terminalDashboard.queuePanel.error' })}</p>
         <p className="text-xs mt-1 opacity-70">{error.message}</p>
       </div>