Fix: Karte CSS-Filter statt CartoDB Dark, Social Wrapper 860px

Karte Dark-Mode:
- CSS-Filter statt CartoDB Dark Matter (war zu dunkel)
  invert(93%) hue-rotate(180deg) brightness(0.88) contrast(0.88) saturate(0.85)
  Gleiche OSM-Tiles, Marker bleiben unbeeinflusst (tilePane separater Layer)
- Filter sofort bei Init + bei Theme-Wechsel via MutationObserver

Social:
- Outer Wrapper width:100%;max-width:860px;margin:0 auto
  Header-Karte und Tabs sind jetzt konsistent gleich breit
SW by-v1023, APP_VER 1023

backend/static/js/pages/map.js

@@ -533,7 +533,10 @@ window.Page_map = (() => {
     _tileLayer = _buildTileLayer();
     _tileLayer.addTo(_map);
 
-    // Theme-Wechsel → Tile-Layer tauschen
+    // Sofort Dark-Filter anwenden wenn nötig (nach Tile-Load)
+    _tileLayer.on('load', _applyTileTheme);
+    _applyTileTheme();
+    // Theme-Wechsel → Filter aktualisieren
     _themeObserver = new MutationObserver(() => _applyTileTheme());
     _themeObserver.observe(document.documentElement, { attributes: true, attributeFilter: ['data-theme'] });
     window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', _applyTileTheme);
@@ -629,28 +632,17 @@ window.Page_map = (() => {
     return window.matchMedia('(prefers-color-scheme: dark)').matches;
   }
 
+  const _OSM_URL = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+  const _DARK_FILTER = 'invert(93%) hue-rotate(180deg) brightness(0.88) contrast(0.88) saturate(0.85)';
+
   function _buildTileLayer() {
-    if (_isDarkMode()) {
-      return L.tileLayer(
-        'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png',
-        { maxZoom: 19, subdomains: 'abcd' }
-      );
-    }
-    return L.tileLayer(
-      'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
-      { maxZoom: 19 }
-    );
+    return L.tileLayer(_OSM_URL, { maxZoom: 19 });
   }
 
   function _applyTileTheme() {
-    if (!_map || !window.L) return;
-    const dark = _isDarkMode();
-    const url  = dark
-      ? 'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png'
-      : 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
-    if (_tileLayer) {
-      _tileLayer.setUrl(url);
-    }
+    if (!_map) return;
+    const tilePaneEl = _map.getPane('tilePane');
+    if (tilePaneEl) tilePaneEl.style.filter = _isDarkMode() ? _DARK_FILTER : '';
   }
 
   function _updateZoomDisplay() {