feat(crypto): add SurfSense 2.0 Crypto Co-Pilot UI components

Frontend - Web Dashboard:
- Add crypto dashboard page with Watchlist, Alerts, Market, Profile tabs
- Add 11 tool-ui components for inline chat display
- Add crypto components (ChainIcon, SafetyBadge, PriceDisplay, etc.)
- Add modals (AddTokenModal, CreateAlertModal)
- Add mock data for development

Frontend - Browser Extension:
- Add shared components (ChainIcon, RiskBadge, PriceDisplay, SuggestionCard)
- Add crypto components (SafetyScoreDisplay, WatchlistPanel, AlertConfigModal)
- Add chat enhancements (WelcomeScreen, ThinkingStepsDisplay)
- Add widget components for inline display
- Enhance TokenInfoCard, ChatHeader, ChatInput, ChatInterface

Documentation:
- Add conversational UX specification
- Add UX analysis report
- Update extension UX design

This implements the Conversational UX paradigm where crypto features
are AI-callable tools that render inline in the chat interface.

surfsense_web/components/layout/providers/LayoutDataProvider.tsx

@@ -2,7 +2,7 @@
 
 import { useQuery, useQueryClient } from "@tanstack/react-query";
 import { useAtomValue, useSetAtom } from "jotai";
-import { Inbox, LogOut, SquareLibrary, Trash2 } from "lucide-react";
+import { Coins, Inbox, LogOut, SquareLibrary, Trash2 } from "lucide-react";
 import { useParams, usePathname, useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { useTheme } from "next-themes";
@@ -241,6 +241,12 @@ export function LayoutDataProvider({
 				icon: SquareLibrary,
 				isActive: pathname?.includes("/documents"),
 			},
+			{
+				title: "Crypto",
+				url: `/dashboard/${searchSpaceId}/crypto`,
+				icon: Coins,
+				isActive: pathname?.includes("/crypto"),
+			},
 		],
 		[searchSpaceId, pathname, isInboxSidebarOpen, totalUnreadCount]
 	);