feat: currency rate chart + swap button#20
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- Chart.js sparkline below currency converter showing rate history - Period selector: 1D, 1W, 1M (default month) - Chart updates when currencies change - Swap button (⇅) to quickly reverse from/to currencies - API endpoint /api/rates-history returns historical rates - Uses existing CurrencyService for rate data
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| val = None | ||
| if val: | ||
| points.append({'date': d.strftime('%d/%m'), 'rate': round(val, 4)}) | ||
| except Exception: |
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Adds a sparkline chart below the currency converter on the dashboard showing exchange rate history. Period selector (1D/1W/1M), swap button to reverse currencies. Uses Chart.js CDN.