feat: add Citations and WatchlistChat components, integrate with API

- Implemented Citations component to display citation data.
- Created WatchlistDrawer and ChatSidebar components for managing watchlists and AI chat functionality.
- Integrated API calls for watchlist management and chat interactions.
- Updated index.tsx to include new components in the main application layout.
- Added API client in lib/api.ts for structured API interactions.
- Developed Alerts, Dashboard, Portfolio, Routines, Screener, and Report pages with relevant data fetching and UI components.
- Introduced styles in tokens.css for consistent theming across the application.
- Configured TypeScript and Vite for project setup and development.

backend/tests/fixtures/segments_bbca.json

@@ -0,0 +1,16 @@
+{
+ "symbol": "BBCA.JK",
+ "financial_year": 2025,
+ "revenue_breakdown": [
+  {
+   "value": 67446394000000,
+   "source": "Loans",
+   "target": "Interest Income"
+  },
+  {
+   "value": 12000000000,
+   "source": "Fees",
+   "target": "Non-Interest Income"
+  }
+ ]
+}