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/PortfolioWidget.tsx

@@ -0,0 +1,43 @@
+import { PortfolioPanel, type PortfolioData, type PortfolioHolding } from "../portfolio/PortfolioPanel";
+
+export interface PortfolioWidgetProps {
+    /** Portfolio data */
+    portfolio: PortfolioData;
+    /** Callback when refresh is clicked */
+    onRefresh?: () => void;
+    /** Callback when "Analyze" is clicked for a token */
+    onAnalyzeToken?: (holding: PortfolioHolding) => void;
+    /** Callback when "Set Alert" is clicked for a token */
+    onSetAlert?: (holding: PortfolioHolding) => void;
+    /** Callback when "View on DexScreener" is clicked */
+    onViewToken?: (holding: PortfolioHolding) => void;
+    /** Callback when "Add Manual Position" is clicked */
+    onAddPosition?: () => void;
+}
+
+/**
+ * PortfolioWidget - Inline portfolio display in chat
+ * Wraps PortfolioPanel for conversational UX
+ */
+export function PortfolioWidget({
+    portfolio,
+    onRefresh,
+    onAnalyzeToken,
+    onSetAlert,
+    onViewToken,
+    onAddPosition,
+}: PortfolioWidgetProps) {
+    return (
+        <div className="my-3 max-h-[600px] overflow-hidden rounded-lg border">
+            <PortfolioPanel
+                portfolio={portfolio}
+                onRefresh={onRefresh}
+                onAnalyzeToken={onAnalyzeToken}
+                onSetAlert={onSetAlert}
+                onViewToken={onViewToken}
+                onAddPosition={onAddPosition}
+            />
+        </div>
+    );
+}
+