Add accounts expansion, analytics, exchange rates, API tokens, PWA support, and UI overhaul

- Expand Account model with account_type (pension, savings, liability, crypto), new banks/currencies (BTC, XMR, FCL, ROP, VOL, MEMP, MPAT, MORTGAGE), and next_payment field
- Add exchange rate endpoint (BCCR integration), analytics endpoint, paste-import for transactions, and API token management
- Add PWA manifest, service worker, and app icons
- Redesign dashboard, transactions, transfers, and login pages with theme support
- Add billing cycle selector, confirm dialog, and paste import modal components
- One-time DB reset in deploy workflow for schema migration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -13,7 +13,8 @@
     "lucide-react": "^0.562.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
-    "react-router-dom": "^7.12.0"
+    "react-router-dom": "^7.12.0",
+    "recharts": "^3.8.0"
   },
   "devDependencies": {
     "@tailwindcss/vite": "^4.1.18",