Fix duplicate trash drop listener and rectangle selection bugs

- Move trash button drop listener out of setupDrag() to an IIFE so it
  only registers once (was accumulating listeners on every render() call,
  causing multiple toast messages on single drop).
- Fix rectangle selection mousedown handler: use optional chaining on
  closest() for safety with text nodes; avoid calling render() inside
  mousedown (which would detach the event target's children mid-handler)
  and instead just remove .selected class directly from the DOM.

js/app.js

@@ -869,21 +869,6 @@ function setupDrag() {
         el.ondragleave = function(e) { this.classList.remove('drag-over'); };
         el.ondrop = function(e) { e.preventDefault(); e.stopPropagation(); this.classList.remove('drag-over'); const fromId = parseInt(e.dataTransfer.getData('text/plain')); const toId = parseInt(this.dataset.id); if (!fromId || !toId) return; const ids = selectedIds.has(fromId) && selectedIds.size > 1 ? [...selectedIds] : [fromId]; if (ids.length === 1 && ids[0] === toId) return; const base = order.length > 0 ? order : entries.filter(e => e).map(e => e.id); const filtered = base.filter(id => !ids.includes(id)); const idx = filtered.indexOf(toId); idx > -1 ? filtered.splice(idx, 0, ...ids) : filtered.push(...ids); order = filtered; localStorage.setItem('entryOrder', JSON.stringify(order)); const map = new Map(entries.filter(e => e).map(e => [e.id, e])); entries = order.map(id => map.get(id)).filter(e => e); entries.sort((a, b) => (b.favorite || 0) - (a.favorite || 0)); render(); };
     });
-    // Trash button as drop target for multi-delete
-    const trashBtn = document.getElementById('trashBtn');
-    if (trashBtn) {
-        trashBtn.addEventListener('dragover', e => { if (!showTrash) { e.preventDefault(); trashBtn.classList.add('drag-over'); } });
-        trashBtn.addEventListener('dragleave', () => trashBtn.classList.remove('drag-over'));
-        trashBtn.addEventListener('drop', async function(e) {
-            e.preventDefault();
-            this.classList.remove('drag-over');
-            const id = parseInt(e.dataTransfer.getData('text/plain'));
-            if (!id) return;
-            const ids = selectedIds.has(id) && selectedIds.size > 1 ? [...selectedIds] : [id];
-            for (const sid of ids) await delEntry(sid);
-            clearSelection();
-        });
-    }
 }
 
 // ==================== EDIT ====================
@@ -1138,16 +1123,38 @@ if (token && curUser) {
 }
 
 ['click', 'keypress', 'scroll', 'mousemove'].forEach(e => document.addEventListener(e, () => { if (token) resetIdle(); }));
+// Trash button as drop target (set up once, outside setupDrag to avoid duplicates)
+(function() {
+    const trashBtn = document.getElementById('trashBtn');
+    if (trashBtn) {
+        trashBtn.addEventListener('dragover', e => { if (!showTrash) { e.preventDefault(); trashBtn.classList.add('drag-over'); } });
+        trashBtn.addEventListener('dragleave', () => trashBtn.classList.remove('drag-over'));
+        trashBtn.addEventListener('drop', async function(e) {
+            e.preventDefault();
+            this.classList.remove('drag-over');
+            const id = parseInt(e.dataTransfer.getData('text/plain'));
+            if (!id) return;
+            const ids = selectedIds.has(id) && selectedIds.size > 1 ? [...selectedIds] : [id];
+            for (const sid of ids) await delEntry(sid);
+            clearSelection();
+        });
+    }
+})();
+
 // Rectangle selection
 document.getElementById('entriesContainer').addEventListener('mousedown', function(e) {
     if (rectState.active || e.button !== 0) return;
-    if (e.target.closest('[draggable="true"]') || e.target.closest('.action-btns')) return;
+    if (e.target?.closest?.('[draggable="true"]') || e.target?.closest?.('.action-btns')) return;
     rectState.active = true;
     rectState.startX = e.clientX;
     rectState.startY = e.clientY;
     rectState.started = false;
     rectState.el = null;
-    clearSelection();
+    // Clear selection without full re-render to avoid detaching event target
+    selectedIds.clear();
+    lastSelectedId = null;
+    hideBatchBar();
+    document.getElementById('entriesContainer')?.querySelectorAll('.selected').forEach(el => el.classList.remove('selected'));
 });
 document.addEventListener('mousemove', function(e) {
     if (!rectState.active) return;