feat(chat): integrate Epic 2, 3, 4 widgets into chat interface

- Create 5 widget wrappers for inline chat display:
  * WhaleActivityWidget - Wraps WhaleActivityFeed for whale transaction display
  * TradingSuggestionWidget - Wraps TradingSuggestionPanel for entry/exit suggestions
  * PortfolioWidget - Wraps PortfolioPanel for portfolio tracking
  * ChartCaptureWidget - Wraps ChartCapturePanel for chart screenshots
  * ThreadGeneratorWidget - Wraps ThreadGeneratorPanel for Twitter threads

- Update widgets/index.ts to export new widgets with Epic grouping

- Update ChatMessages.tsx:
  * Add 5 new widget types to MessageWidget union
  * Import new widget components and their types
  * Add renderWidget cases for all new widgets with proper callbacks
  * Update component documentation to list all supported widgets

- Widget integration pattern:
  * Widgets wrap panels in containers with consistent styling
  * All widgets support callback props for user interactions
  * Widgets can be embedded inline in assistant messages
  * Widget actions are handled via onWidgetAction callback

Enables AI to display Epic 2, 3, 4 panels inline in chat conversations

surfsense_browser_extension/sidepanel/widgets/TradingSuggestionWidget.tsx

@@ -0,0 +1,31 @@
+import { TradingSuggestionPanel, type TradingSuggestion } from "../analysis/TradingSuggestionPanel";
+
+export interface TradingSuggestionWidgetProps {
+    /** Trading suggestion data */
+    suggestion: TradingSuggestion;
+    /** Callback when "Set Alerts" is clicked */
+    onSetAlerts?: () => void;
+    /** Callback when "View Chart" is clicked */
+    onViewChart?: () => void;
+}
+
+/**
+ * TradingSuggestionWidget - Inline trading suggestion display in chat
+ * Wraps TradingSuggestionPanel for conversational UX
+ */
+export function TradingSuggestionWidget({
+    suggestion,
+    onSetAlerts,
+    onViewChart,
+}: TradingSuggestionWidgetProps) {
+    return (
+        <div className="my-3 max-h-[600px] overflow-hidden rounded-lg border">
+            <TradingSuggestionPanel
+                suggestion={suggestion}
+                onSetAlerts={onSetAlerts}
+                onViewChart={onViewChart}
+            />
+        </div>
+    );
+}
+