Fix: Fehler beim Laden wenn Kacheln ausgeblendet sind

_applyLayout entfernte Widgets ohne die Card-Elemente vorher zu parken.
Beim Wiederherstellen eines Layouts mit versteckten Kacheln (z.B. Timeline)
gingen die DOM-Elemente verloren, was zu null-Referenz-Fehlern fuehrte.

Fixes:
- layout.js: Cards in tile-parking retten bevor Widget entfernt wird
- app.js: Null-Guards in rerenderTimeline und _updateTimelineCount

src/static/js/app.js

@@ -960,6 +960,7 @@ const App = {
         const articleCount = entries.filter(e => e.kind === 'article').length;
         const snapshotCount = entries.filter(e => e.kind === 'snapshot').length;
         const countEl = document.getElementById('article-count');
+        if (!countEl) return;
         if (articleCount > 0 && snapshotCount > 0) {
             countEl.innerHTML = `<span class="ht-legend-dot"></span> ${articleCount} Meldung${articleCount !== 1 ? 'en' : ''} + <span class="ht-legend-dot ht-legend-gold"></span> ${snapshotCount} Lagebericht${snapshotCount !== 1 ? 'e' : ''}`;
         } else if (articleCount > 0) {
@@ -978,7 +979,8 @@ const App = {
 
     rerenderTimeline() {
         const container = document.getElementById('timeline');
-        const searchTerm = (document.getElementById('timeline-search').value || '').toLowerCase();
+        if (!container) return;
+        const searchTerm = (document.getElementById('timeline-search')?.value || '').toLowerCase();
         const filterType = this._timelineFilter;
         const range = this._timelineRange;
 

src/static/js/layout.js

@@ -70,6 +70,15 @@ const LayoutManager = {
 
             if (item.visible === false) {
                 this._hiddenTiles[item.id] = item;
+                // Card in tile-parking retten bevor Widget entfernt wird
+                const selector = this.TILE_MAP[item.id];
+                if (selector) {
+                    const cardEl = el.el.querySelector(selector);
+                    if (cardEl) {
+                        const parking = document.getElementById("tile-parking");
+                        if (parking) parking.appendChild(cardEl);
+                    }
+                }
                 this._grid.removeWidget(el.el, true, false);
             } else {
                 this._grid.update(el.el, { x: item.x, y: item.y, w: item.w, h: item.h });