Fix Ctrl+A and add Delete key shortcut

Ctrl+A auth check was inverted (!hidden instead of hidden), preventing selection in vault. Added Delete key shortcut: moves selected entries to trash (or batch permanent delete in trash view). Added Del to keyboard shortcuts help.

js/app.js

@@ -1244,7 +1244,7 @@ function highlightText(text, query) {
 function showShortcutsHelp() {
     const overlay = document.createElement('div');
     overlay.className = 'custom-modal-overlay show';
-    overlay.innerHTML = `<div class="custom-modal" style="min-width:380px"><h3>⌨️ Keyboard Shortcuts</h3><div style="display:grid;grid-template-columns:auto 1fr;gap:0.5rem 1.2rem;font-size:0.85rem;margin-bottom:1rem"><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+N</span><span>New entry</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+A</span><span>Select all</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+F</span><span>Search</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+T</span><span>Toggle trash</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+L</span><span>Lock vault</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+S</span><span>Save entry</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Esc</span><span>Close modal / deselect</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">◀ ▶</span><span>Detail view nav</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">?</span><span>Show this help</span></div><p style="color:var(--text2);font-size:0.8rem;margin-bottom:0.8rem">💡 Click any entry to select, Shift+click for range, Ctrl+click to toggle</p><div class="modal-actions"><button class="btn btn-sm" onclick="this.closest('.custom-modal-overlay').remove()">Got it</button></div></div>`;
+    overlay.innerHTML = `<div class="custom-modal" style="min-width:380px"><h3>⌨️ Keyboard Shortcuts</h3><div style="display:grid;grid-template-columns:auto 1fr;gap:0.5rem 1.2rem;font-size:0.85rem;margin-bottom:1rem"><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+N</span><span>New entry</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+A</span><span>Select all</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+F</span><span>Search</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+T</span><span>Toggle trash</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+L</span><span>Lock vault</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Ctrl+S</span><span>Save entry</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Del</span><span>Delete selected</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">Esc</span><span>Close modal / deselect</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">◀ ▶</span><span>Detail view nav</span><span style="background:var(--input);padding:0.15rem 0.6rem;border-radius:0.4rem;font-family:monospace;text-align:center">?</span><span>Show this help</span></div><p style="color:var(--text2);font-size:0.8rem;margin-bottom:0.8rem">💡 Click any entry to select, Shift+click for range, Ctrl+click to toggle</p><div class="modal-actions"><button class="btn btn-sm" onclick="this.closest('.custom-modal-overlay').remove()">Got it</button></div></div>`;
     document.body.appendChild(overlay);
     overlay.addEventListener('click', e => { if (e.target === overlay) overlay.remove(); });
 }
@@ -1409,6 +1409,14 @@ document.addEventListener('keydown', function(e) {
         return;
     }
 
+    // Delete key — move to trash or permanently delete selected entries
+    if (e.key === 'Delete' && !isInput && selectedIds.size > 0 && document.getElementById('authSection').classList.contains('hidden')) {
+        e.preventDefault();
+        if (showTrash) batchPermanentDelete();
+        else batchDelete();
+        return;
+    }
+
     // Only handle Ctrl+[key], no Shift/Alt/Meta
     if (!e.ctrlKey || e.shiftKey || e.altKey || e.metaKey) return;
     
@@ -1431,7 +1439,7 @@ document.addEventListener('keydown', function(e) {
         if (document.getElementById('addModal').classList.contains('show')) addEntry();
         else if (document.getElementById('editModal').classList.contains('show')) saveEdit();
     } else if (code === 'KeyA') {
-        if (!isInput && !document.getElementById('authSection').classList.contains('hidden')) {
+        if (!isInput && document.getElementById('authSection').classList.contains('hidden')) {
             getFilteredEntries(view === 'grouped' || view === 'detail').forEach(e => selectedIds.add(e.id));
             updateBatchBar();
             render();