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/corp_actions_bbca.json

@@ -0,0 +1,26 @@
+{
+ "symbol": "BBCA.JK",
+ "corporate_actions": {
+  "dividend": [
+   {
+    "ex_date": "2025-06-01",
+    "dividend_per_share": 250
+   }
+  ],
+  "upcoming_dividend": [
+   {
+    "ex_date": "2026-10-07",
+    "dividend_per_share": 270
+   }
+  ],
+  "agm": [
+   {
+    "date": "2026-11-20"
+   }
+  ],
+  "stock_split": [],
+  "right_issue": [],
+  "warrant": [],
+  "bonus": []
+ }
+}