v2.5.6: Open-Meteo weather, WebSocket fixes, admin improvements

- Replace OpenWeatherMap with Open-Meteo (no API key needed)
  - 16-day forecast (up from 5 days)
  - Historical climate averages as fallback beyond 16 days
  - Auto-upgrade from climate to real forecast when available
- Fix Vacay WebSocket sync across devices (socket-ID exclusion instead of user-ID)
- Add GitHub release history tab in admin panel
- Show cluster count "1" for single map markers when zoomed out
- Add weather info panel in admin settings (replaces OpenWeatherMap key input)
- Update i18n translations (DE + EN)

client/src/components/Budget/BudgetPanel.jsx

@@ -1,9 +1,8 @@
 import React, { useState, useEffect, useRef, useMemo } from 'react'
 import { useTripStore } from '../../store/tripStore'
 import { useTranslation } from '../../i18n'
-import { Plus, Trash2, Calculator, Wallet, ArrowRightLeft } from 'lucide-react'
+import { Plus, Trash2, Calculator, Wallet } from 'lucide-react'
 import CustomSelect from '../shared/CustomSelect'
-import { exchangeApi } from '../../api/client'
 
 // ── Helpers ──────────────────────────────────────────────────────────────────
 const CURRENCIES = ['EUR', 'USD', 'GBP', 'JPY', 'CHF', 'CZK', 'PLN', 'SEK', 'NOK', 'DKK', 'TRY', 'THB', 'AUD', 'CAD']
@@ -154,15 +153,6 @@ export default function BudgetPanel({ tripId }) {
   const { t, locale } = useTranslation()
   const [newCategoryName, setNewCategoryName] = useState('')
   const currency = trip?.currency || 'EUR'
-  const [rates, setRates] = useState(null)
-  const [convertTo, setConvertTo] = useState(() => {
-    const saved = localStorage.getItem('budget_convert_to')
-    return saved || (currency === 'EUR' ? 'USD' : 'EUR')
-  })
-
-  useEffect(() => {
-    exchangeApi.getRates().then(setRates).catch(() => {})
-  }, [])
 
   const fmt = (v, cur) => fmtNum(v, locale, cur)
 
@@ -361,38 +351,6 @@ export default function BudgetPanel({ tripId }) {
               {Number(grandTotal).toLocaleString(locale, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
             </div>
             <div style={{ fontSize: 14, color: 'rgba(255,255,255,0.5)', fontWeight: 500 }}>{SYMBOLS[currency] || currency} {currency}</div>
-
-            {/* Live exchange rate conversion */}
-            {rates && (() => {
-              const fromRate = currency === 'EUR' ? 1 : rates.rates?.[currency]
-              const toRate = convertTo === 'EUR' ? 1 : rates.rates?.[convertTo]
-              const converted = fromRate && toRate ? (grandTotal / fromRate) * toRate : null
-              return converted != null ? (
-                <div style={{ marginTop: 16, paddingTop: 14, borderTop: '1px solid rgba(255,255,255,0.1)' }}>
-                  <div style={{ display: 'flex', alignItems: 'center', gap: 6, marginBottom: 8 }}>
-                    <ArrowRightLeft size={12} style={{ color: 'rgba(255,255,255,0.4)' }} />
-                    <span style={{ fontSize: 10, color: 'rgba(255,255,255,0.4)', fontWeight: 500, textTransform: 'uppercase', letterSpacing: 0.5 }}>{t('budget.converted')}</span>
-                  </div>
-                  <div style={{ display: 'flex', alignItems: 'baseline', gap: 8 }}>
-                    <span style={{ fontSize: 20, fontWeight: 700 }}>
-                      {Number(converted).toLocaleString(locale, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
-                    </span>
-                    <select
-                      value={convertTo}
-                      onChange={e => { setConvertTo(e.target.value); localStorage.setItem('budget_convert_to', e.target.value) }}
-                      style={{ background: 'rgba(255,255,255,0.1)', border: 'none', borderRadius: 6, color: 'rgba(255,255,255,0.7)', fontSize: 12, fontWeight: 600, padding: '2px 4px', cursor: 'pointer', fontFamily: 'inherit' }}
-                    >
-                      {CURRENCIES.filter(c => c !== currency).map(c => (
-                        <option key={c} value={c}>{c}</option>
-                      ))}
-                    </select>
-                  </div>
-                  <div style={{ fontSize: 10, color: 'rgba(255,255,255,0.3)', marginTop: 4 }}>
-                    1 {currency} = {((toRate / fromRate) || 0).toFixed(4)} {convertTo}
-                  </div>
-                </div>
-              ) : null
-            })()}
           </div>
 
           {pieSegments.length > 0 && (