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/src/components/BillingCycleSelector.tsx

@@ -0,0 +1,54 @@
+import { useEffect, useState } from 'react';
+import { Calendar, ChevronDown } from 'lucide-react';
+import api from '../api';
+
+export interface CycleOption {
+  year: number;
+  month: number;
+  label: string;
+  count: number;
+  total: number;
+}
+
+interface Props {
+  value: { year: number; month: number } | null;
+  onChange: (cycle: { year: number; month: number } | null) => void;
+}
+
+export default function BillingCycleSelector({ value, onChange }: Props) {
+  const [cycles, setCycles] = useState<CycleOption[]>([]);
+
+  useEffect(() => {
+    api.get('/transactions/cycles').then((r) => setCycles(r.data));
+  }, []);
+
+  const selectedKey = value ? `${value.year}-${value.month}` : '';
+
+  return (
+    <div className="flex items-center gap-2">
+      <Calendar className="w-4 h-4 text-text-muted" />
+      <div className="relative">
+        <select
+          value={selectedKey}
+          onChange={(e) => {
+            if (!e.target.value) {
+              onChange(null);
+            } else {
+              const [y, m] = e.target.value.split('-').map(Number);
+              onChange({ year: y, month: m });
+            }
+          }}
+          className="appearance-none bg-input-bg border border-border rounded-lg pl-3 pr-9 py-2 text-sm text-text-primary focus:outline-none focus:border-[#606C38]/50 transition-colors"
+        >
+          <option value="">All time</option>
+          {cycles.map((c) => (
+            <option key={`${c.year}-${c.month}`} value={`${c.year}-${c.month}`}>
+              {c.label} ({c.count})
+            </option>
+          ))}
+        </select>
+        <ChevronDown className="absolute right-2.5 top-1/2 -translate-y-1/2 w-4 h-4 text-text-muted pointer-events-none" />
+      </div>
+    </div>
+  );
+}