Update dashboard and automation colors to new module scheme

Dashboard widgets:
- WorkflowPipelineWidget: Sites now has transparent bg with colored icon
- Tasks stage uses navy (gray-700/800), Content/Drafts use blue (brand)
- AIOperationsWidget: Content now uses blue (brand) instead of green
- RecentActivityWidget: Content activity now uses blue (brand)
- QuickActionsWidget: Tasks step uses navy, Content uses blue

Automation components:
- AutomationPage STAGE_CONFIG: Tasks→Content now navy, Content→Prompts blue
- GlobalProgressBar: Updated stage colors to match new scheme
- CurrentProcessingCard: Stage colors match new module scheme

Color scheme:
- Planner Pipeline (Blue → Pink → Amber): Keywords, Clusters, Ideas
- Writer Pipeline (Navy → Blue → Pink → Green): Tasks, Content, Images, Published

frontend/src/components/dashboard/RecentActivityWidget.tsx

@@ -30,10 +30,21 @@ interface RecentActivityWidgetProps {
   loading?: boolean;
 }
 
+/**
+ * Activity config with solid colored backgrounds for visual distinction:
+ * - clustering: purple/pink (matches Clusters module)
+ * - ideas: warning/amber (matches Ideas module)
+ * - content: brand/primary (blue) - matches Writer content module
+ * - images: purple/pink (matches Images module)
+ * - published: success/green (matches Published module)
+ * - keywords: brand/primary (blue) - matches Keywords module
+ * - error: error/red
+ * - sync: success/green
+ */
 const activityConfig: Record<string, { icon: typeof GroupIcon; gradient: string }> = {
   clustering: { icon: GroupIcon, gradient: 'from-purple-500 to-purple-600' },
   ideas: { icon: BoltIcon, gradient: 'from-warning-500 to-warning-600' },
-  content: { icon: FileTextIcon, gradient: 'from-success-500 to-success-600' },
+  content: { icon: FileTextIcon, gradient: 'from-brand-500 to-brand-600' },
   images: { icon: FileIcon, gradient: 'from-purple-500 to-purple-600' },
   published: { icon: PaperPlaneIcon, gradient: 'from-success-500 to-success-600' },
   keywords: { icon: ListIcon, gradient: 'from-brand-500 to-brand-600' },