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/ChartCaptureWidget.tsx

@@ -0,0 +1,31 @@
+import { ChartCapturePanel, type ChartCaptureMetadata } from "../capture/ChartCapturePanel";
+
+export interface ChartCaptureWidgetProps {
+    /** Current token metadata */
+    metadata?: ChartCaptureMetadata;
+    /** Callback when capture is clicked */
+    onCapture?: () => void;
+    /** Callback when export is clicked */
+    onExport?: (format: "twitter" | "telegram" | "instagram" | "clipboard") => void;
+}
+
+/**
+ * ChartCaptureWidget - Inline chart capture tool in chat
+ * Wraps ChartCapturePanel for conversational UX
+ */
+export function ChartCaptureWidget({
+    metadata,
+    onCapture,
+    onExport,
+}: ChartCaptureWidgetProps) {
+    return (
+        <div className="my-3 max-h-[600px] overflow-hidden rounded-lg border">
+            <ChartCapturePanel
+                metadata={metadata}
+                onCapture={onCapture}
+                onExport={onExport}
+            />
+        </div>
+    );
+}
+