feat: expand budget currencies from 14 to 46 — closes #96

Add BDT, INR, BRL, MXN, KRW, CNY, SGD, PHP, VND, ZAR, AED, SAR, ILS,
EGP, MAD, HUF, RON, BGN, HRK, ISK, RUB, UAH, LKR, CLP, COP, PEN, ARS,
NZD, IDR, MYR, HKD, TWD with correct currency symbols.

client/src/components/Budget/BudgetPanel.tsx

@@ -29,8 +29,23 @@ interface PerPersonSummaryEntry {
 }
 
 // ── Helpers ──────────────────────────────────────────────────────────────────
-const CURRENCIES = ['EUR', 'USD', 'GBP', 'JPY', 'CHF', 'CZK', 'PLN', 'SEK', 'NOK', 'DKK', 'TRY', 'THB', 'AUD', 'CAD']
-const SYMBOLS = { EUR: '€', USD: '$', GBP: '£', JPY: '¥', CHF: 'CHF', CZK: 'Kč', PLN: 'zł', SEK: 'kr', NOK: 'kr', DKK: 'kr', TRY: '₺', THB: '฿', AUD: 'A$', CAD: 'C$' }
+const CURRENCIES = [
+  'EUR', 'USD', 'GBP', 'JPY', 'CHF', 'CZK', 'PLN', 'SEK', 'NOK', 'DKK',
+  'TRY', 'THB', 'AUD', 'CAD', 'NZD', 'BRL', 'MXN', 'INR', 'IDR', 'MYR',
+  'PHP', 'SGD', 'KRW', 'CNY', 'HKD', 'TWD', 'ZAR', 'AED', 'SAR', 'ILS',
+  'EGP', 'MAD', 'HUF', 'RON', 'BGN', 'HRK', 'ISK', 'RUB', 'UAH', 'BDT',
+  'LKR', 'VND', 'CLP', 'COP', 'PEN', 'ARS',
+]
+const SYMBOLS = {
+  EUR: '€', USD: '$', GBP: '£', JPY: '¥', CHF: 'CHF', CZK: 'Kč', PLN: 'zł',
+  SEK: 'kr', NOK: 'kr', DKK: 'kr', TRY: '₺', THB: '฿', AUD: 'A$', CAD: 'C$',
+  NZD: 'NZ$', BRL: 'R$', MXN: 'MX$', INR: '₹', IDR: 'Rp', MYR: 'RM',
+  PHP: '₱', SGD: 'S$', KRW: '₩', CNY: '¥', HKD: 'HK$', TWD: 'NT$',
+  ZAR: 'R', AED: 'د.إ', SAR: '﷼', ILS: '₪', EGP: 'E£', MAD: 'MAD',
+  HUF: 'Ft', RON: 'lei', BGN: 'лв', HRK: 'kn', ISK: 'kr', RUB: '₽',
+  UAH: '₴', BDT: '৳', LKR: 'Rs', VND: '₫', CLP: 'CL$', COP: 'CO$',
+  PEN: 'S/.', ARS: 'AR$',
+}
 const PIE_COLORS = ['#6366f1', '#ec4899', '#f59e0b', '#10b981', '#3b82f6', '#8b5cf6', '#ef4444', '#14b8a6', '#f97316', '#06b6d4', '#84cc16', '#a855f7']
 
 const fmtNum = (v, locale, cur) => {