fix(frontend): add missing i18n keys and improve workspace switch cache invalidation

- Add common.status.ready i18n key for zh/en locales
- Add ready/initialized/archived/failed status colors to dashboard widgets
- Expand QueryInvalidator to invalidate projectOverview, workflowStatusCounts,
  and dashboardStats queries on workspace switch

ccw/frontend/src/App.tsx

@@ -53,13 +53,18 @@ function QueryInvalidator() {
   const registerQueryInvalidator = useWorkflowStore((state) => state.registerQueryInvalidator);
 
   useEffect(() => {
-    // Register callback to invalidate all 'workspace' prefixed queries
+    // Register callback to invalidate all workspace-related queries on workspace switch
     const callback = () => {
       queryClient.invalidateQueries({
         predicate: (query) => {
           const queryKey = query.queryKey;
-          // Check if the first element of the query key is 'workspace'
-          return Array.isArray(queryKey) && queryKey[0] === 'workspace';
+          if (!Array.isArray(queryKey)) return false;
+          const prefix = queryKey[0];
+          // Invalidate all query families that depend on workspace data
+          return prefix === 'workspace'
+            || prefix === 'projectOverview'
+            || prefix === 'workflowStatusCounts'
+            || prefix === 'dashboardStats';
         },
       });
     };

ccw/frontend/src/components/dashboard/widgets/RecentSessionsWidget.tsx

@@ -69,6 +69,7 @@ const statusIcons: Record<string, React.ElementType> = {
   cancelled: XCircle,
   idle: Clock,
   initializing: Loader2,
+  ready: CheckCircle2,
 };
 
 // Status color mapping
@@ -83,6 +84,7 @@ const statusColors: Record<string, string> = {
   cancelled: 'bg-destructive/20 text-destructive border-destructive/30',
   idle: 'bg-muted text-muted-foreground border-border',
   initializing: 'bg-info/20 text-info border-info/30',
+  ready: 'bg-success/20 text-success border-success/30',
 };
 
 // Status to i18n key mapping
@@ -97,6 +99,7 @@ const statusI18nKeys: Record<string, string> = {
   cancelled: 'cancelled',
   idle: 'idle',
   initializing: 'initializing',
+  ready: 'ready',
 };
 
 // Lite task sub-type icons

ccw/frontend/src/components/dashboard/widgets/WorkflowTaskWidget.tsx

@@ -119,6 +119,10 @@ const sessionStatusColors: Record<string, { bg: string; text: string }> = {
   in_progress: { bg: 'bg-warning/20', text: 'text-warning' },
   completed: { bg: 'bg-success/20', text: 'text-success' },
   paused: { bg: 'bg-slate-400/20', text: 'text-slate-500' },
+  ready: { bg: 'bg-success/20', text: 'text-success' },
+  initialized: { bg: 'bg-info/20', text: 'text-info' },
+  archived: { bg: 'bg-slate-300/20', text: 'text-slate-400' },
+  failed: { bg: 'bg-destructive/20', text: 'text-destructive' },
 };
 
 // ---- Mini Stat Card with Sparkline ----

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

@@ -82,7 +82,8 @@
     "label": "Status",
     "openIssues": "Open Issues",
     "enabled": "Enabled",
-    "disabled": "Disabled"
+    "disabled": "Disabled",
+    "ready": "Ready"
   },
   "priority": {
     "low": "Low",

ccw/frontend/src/locales/zh/common.json

@@ -82,7 +82,8 @@
     "label": "状态",
     "openIssues": "开放问题",
     "enabled": "已启用",
-    "disabled": "已禁用"
+    "disabled": "已禁用",
+    "ready": "就绪"
   },
   "priority": {
     "low": "低",