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/crypto/index.ts

@@ -0,0 +1,12 @@
+export { PriceDisplay } from "./PriceDisplay";
+export { SafetyBadge } from "./SafetyBadge";
+export { ChainIcon } from "./ChainIcon";
+export { MarketOverview } from "./MarketOverview";
+export { WatchlistTable } from "./WatchlistTable";
+export { AlertsPanel } from "./AlertsPanel";
+export { PortfolioSummary } from "./PortfolioSummary";
+
+// Modal Components
+export { AddTokenModal } from "./AddTokenModal";
+export { CreateAlertModal, type AlertConfig } from "./CreateAlertModal";
+export { UserProfileSection, type UserProfile } from "./UserProfileSection";