diff --git a/build-plugin.sh b/build-plugin.sh
index db8b8d4..5861591 100755
--- a/build-plugin.sh
+++ b/build-plugin.sh
@@ -2,7 +2,7 @@
 set -eu
 
 PLUGIN="u-navigator"
-VERSION="2026.07.04.r005"
+VERSION="2026.07.04.r006"
 PKG_DIR="packages"
 WORK_DIR=".plugin-build"
 PKG_NAME="${PLUGIN}-${VERSION}.tgz"
diff --git a/packages/u-navigator-2026.07.04.r005.tgz b/packages/u-navigator-2026.07.04.r005.tgz
deleted file mode 100644
index 1c09a81..0000000
Binary files a/packages/u-navigator-2026.07.04.r005.tgz and /dev/null differ
diff --git a/packages/u-navigator-2026.07.04.r006.tgz b/packages/u-navigator-2026.07.04.r006.tgz
new file mode 100644
index 0000000..beb91ce
Binary files /dev/null and b/packages/u-navigator-2026.07.04.r006.tgz differ
diff --git a/server/public/app.js b/server/public/app.js
index 480e56b..55e6c68 100644
--- a/server/public/app.js
+++ b/server/public/app.js
@@ -13,6 +13,7 @@ const state = {
   contextMenu: null,
   permissionsDialog: null,
   uploadConflictDialog: null,
+  uiDialog: null,
   draggedEntry: null,
   pointerDrag: null,
   suppressClickPath: null,
@@ -215,6 +216,9 @@ function render() {
   if (state.uploadConflictDialog) {
     workspace.appendChild(renderUploadConflictDialog());
   }
+  if (state.uiDialog) {
+    workspace.appendChild(renderUiDialog());
+  }
   renderTransferPanel();
   renderSettingsPanel();
 }
@@ -1288,8 +1292,8 @@ async function readAllDirectoryEntries(reader) {
 function showError(error) {
   const debug = recordDebug('error.shown', serializeError(error));
   const message = error?.message || String(error);
-  const detail = debug ? `\n\nDebug #${debug.id}: ${debug.label}` : '';
-  alert(`${message}${detail}`);
+  const detail = debug ? `Debug #${debug.id}: ${debug.label}` : '';
+  showMessageDialog('Fehler', message, detail).catch(() => {});
 }
 
 function getDroppedFiles(event) {
@@ -1330,7 +1334,7 @@ async function renameEntry(win, entry) {
     showError(new Error('Read-only mode ist aktiv.'));
     return;
   }
-  const nextName = prompt('Neuer Name', entry.name);
+  const nextName = await showPromptDialog('Umbenennen', 'Neuer Name', entry.name);
   if (!nextName || nextName === entry.name) {
     return;
   }
@@ -1346,7 +1350,11 @@ async function promptTransfer(win, entry, type) {
     showError(new Error('Read-only mode ist aktiv.'));
     return;
   }
-  const targetDir = prompt(type === 'copy' ? 'Kopieren nach Ordner' : 'Verschieben nach Ordner', win.data.path);
+  const targetDir = await showPromptDialog(
+    type === 'copy' ? 'Kopieren' : 'Verschieben',
+    type === 'copy' ? 'Kopieren nach Ordner' : 'Verschieben nach Ordner',
+    win.data.path
+  );
   if (!targetDir) {
     return;
   }
@@ -1364,7 +1372,11 @@ async function deleteEntries(win, entry = null) {
     return;
   }
   const label = entries.length === 1 ? `"${entries[0].name}" wirklich löschen?` : `${entries.length} Objekte wirklich löschen?`;
-  if (!confirm(`${label}\n\nDieser Vorgang löscht direkt vom Dateisystem.`)) {
+  const confirmed = await showConfirmDialog('Löschen bestätigen', label, 'Dieser Vorgang löscht direkt vom Dateisystem.', {
+    confirmLabel: 'Löschen',
+    danger: true
+  });
+  if (!confirmed) {
     return;
   }
   for (const item of entries) {
@@ -1536,6 +1548,108 @@ function closeUploadConflictDialog(action) {
   render();
 }
 
+function showMessageDialog(title, message, detail = '') {
+  return showUiDialog({
+    type: 'message',
+    title,
+    message,
+    detail,
+    confirmLabel: 'OK'
+  });
+}
+
+function showConfirmDialog(title, message, detail = '', options = {}) {
+  return showUiDialog({
+    type: 'confirm',
+    title,
+    message,
+    detail,
+    confirmLabel: options.confirmLabel || 'OK',
+    cancelLabel: options.cancelLabel || 'Abbrechen',
+    danger: Boolean(options.danger)
+  });
+}
+
+function showPromptDialog(title, label, value = '') {
+  return showUiDialog({
+    type: 'prompt',
+    title,
+    message: label,
+    value,
+    confirmLabel: 'OK',
+    cancelLabel: 'Abbrechen'
+  });
+}
+
+function showUiDialog(options) {
+  return new Promise((resolve) => {
+    state.uiDialog = { ...options, resolve };
+    render();
+  });
+}
+
+function renderUiDialog() {
+  const dialog = state.uiDialog;
+  const overlay = document.createElement('div');
+  overlay.className = 'modal-overlay';
+  const isPrompt = dialog.type === 'prompt';
+  const isConfirm = dialog.type === 'confirm';
+  overlay.innerHTML = `
+    <form class="permissions-modal ui-modal" aria-label="${escapeAttr(dialog.title)}">
+      <header>
+        <strong>${escapeHtml(dialog.title)}</strong>
+        <button type="button" class="icon" data-action="cancel" title="Schließen" aria-label="Schließen">${iconSvg('close')}</button>
+      </header>
+      <div class="modal-body">
+        <p>${escapeHtml(dialog.message || '')}</p>
+        ${dialog.detail ? `<p class="muted">${escapeHtml(dialog.detail)}</p>` : ''}
+        ${isPrompt ? `<input name="value" value="${escapeAttr(dialog.value || '')}" aria-label="${escapeAttr(dialog.message || dialog.title)}">` : ''}
+      </div>
+      <footer>
+        ${isConfirm || isPrompt ? `<button type="button" data-action="cancel">${escapeHtml(dialog.cancelLabel || 'Abbrechen')}</button>` : ''}
+        <button type="submit" class="primary ${dialog.danger ? 'danger-action' : ''}">${escapeHtml(dialog.confirmLabel || 'OK')}</button>
+      </footer>
+    </form>
+  `;
+
+  const form = overlay.querySelector('form');
+  form.addEventListener('click', (event) => event.stopPropagation());
+  overlay.addEventListener('click', () => closeUiDialog(cancelDialogValue(dialog)));
+  overlay.querySelectorAll('[data-action="cancel"]').forEach((button) => {
+    button.addEventListener('click', () => closeUiDialog(cancelDialogValue(dialog)));
+  });
+  form.addEventListener('submit', (event) => {
+    event.preventDefault();
+    if (isPrompt) {
+      closeUiDialog(form.elements.value.value);
+      return;
+    }
+    closeUiDialog(isConfirm ? true : undefined);
+  });
+  setTimeout(() => {
+    const focusTarget = isPrompt ? form.elements.value : form.querySelector('.primary');
+    focusTarget?.focus();
+    if (isPrompt) {
+      focusTarget.select();
+    }
+  }, 0);
+  return overlay;
+}
+
+function cancelDialogValue(dialog) {
+  if (dialog.type === 'confirm') return false;
+  if (dialog.type === 'prompt') return null;
+  return undefined;
+}
+
+function closeUiDialog(value) {
+  const dialog = state.uiDialog;
+  if (!dialog) return;
+  state.uiDialog = null;
+  dialog.resolve(value);
+  render();
+}
+
 function permissionMatrixMarkup(mode) {
   const digits = modeToDigits(mode);
   const rows = [
diff --git a/server/public/styles.css b/server/public/styles.css
index 9a0696b..93755ba 100644
--- a/server/public/styles.css
+++ b/server/public/styles.css
@@ -624,6 +624,24 @@
   width: 100%;
 }
 
+.u-nav .ui-modal {
+  width: min(460px, calc(100vw - 28px));
+}
+
+.u-nav .ui-modal .modal-body p {
+  margin: 0;
+  overflow-wrap: anywhere;
+}
+
+.u-nav .ui-modal footer {
+  gap: 8px;
+}
+
+.u-nav .ui-modal .danger-action {
+  background: #c4382d;
+  border-color: #c4382d;
+}
+
 .u-nav .conflict-details {
   background: var(--surface-2);
   border: 1px solid var(--line);
diff --git a/u-navigator.plg b/u-navigator.plg
index 771f1df..6733b4f 100644
--- a/u-navigator.plg
+++ b/u-navigator.plg
@@ -1,7 +1,7 @@
 <!DOCTYPE PLUGIN [
 <!ENTITY name "u-navigator">
 <!ENTITY author "Michael Roll">
-<!ENTITY version "2026.07.04.r005">
+<!ENTITY version "2026.07.04.r006">
 <!ENTITY package "&name;-&version;.tgz">
 <!ENTITY pluginURL "https://git.casaderoll.de/michael/Unraid-Navigator/raw/branch/main/u-navigator.plg">
 <!ENTITY support "https://git.casaderoll.de/michael/Unraid-Navigator">
@@ -24,7 +24,7 @@
 
 <FILE Name="/boot/config/plugins/&name;/&package;">
 <URL>https://git.casaderoll.de/michael/Unraid-Navigator/raw/branch/main/packages/&package;</URL>
-<MD5>e990c21ddfd6cb6be0dd48f8b25bc3f8</MD5>
+<MD5>d7ee76b55ed3afd4dbef81ad29e7a17e</MD5>
 </FILE>
 
 <FILE Run="/bin/bash">