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/ThreadGeneratorWidget.tsx

@@ -0,0 +1,40 @@
+import { ThreadGeneratorPanel, type GeneratedThread } from "../content/ThreadGeneratorPanel";
+
+export interface ThreadGeneratorWidgetProps {
+    /** Current token info */
+    tokenAddress?: string;
+    tokenSymbol?: string;
+    chain?: string;
+    /** Generated thread (if available) */
+    generatedThread?: GeneratedThread;
+    /** Callback when thread is generated */
+    onGenerate?: (request: any) => void;
+    /** Callback when thread is exported */
+    onExport?: (format: "copy" | "twitter") => void;
+}
+
+/**
+ * ThreadGeneratorWidget - Inline thread generator in chat
+ * Wraps ThreadGeneratorPanel for conversational UX
+ */
+export function ThreadGeneratorWidget({
+    tokenAddress,
+    tokenSymbol,
+    chain,
+    generatedThread,
+    onGenerate,
+    onExport,
+}: ThreadGeneratorWidgetProps) {
+    return (
+        <div className="my-3 max-h-[600px] overflow-hidden rounded-lg border">
+            <ThreadGeneratorPanel
+                tokenAddress={tokenAddress}
+                tokenSymbol={tokenSymbol}
+                chain={chain}
+                onGenerate={onGenerate}
+                onExport={onExport}
+            />
+        </div>
+    );
+}
+