App lock: unlock with security keys via the built-in CTAP2 client on Linux too (Chromium returned no PRF result, so adding a YubiKey failed with "does not support hmac-secret"); updates: show only one update dialog at a time (startup and manual check stacked two)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/renderer/app.js

@@ -1338,11 +1338,14 @@ async function importRdm() {
 
 // ============================================================ Updates
 let updateInfo = null;
+let updateDialogOpen = false; // Auto-Prüfung beim Start und manuelle Prüfung sollen keine zwei Dialoge stapeln
 async function showUpdate(info) {
   updateInfo = info;
   const b = $('#updateBadge');
   b.style.display = '';
   b.querySelector('span').textContent = `Update ${info.version}`;
+  if (updateDialogOpen) return;
+  updateDialogOpen = true;
   const r = await modal({
     title: T('MrTerm {v} is available', { v: info.version }),
     text: T('Installed: {v}', { v: info.current }) + (info.asset ? ' · ' + T('Package: {name} ({size})', { name: info.asset.name, size: fmtSize(info.asset.size) }) : ''),
@@ -1350,7 +1353,7 @@ async function showUpdate(info) {
       ${info.kind === 'dev' ? `<p>${T('Development mode: please update via <code>git pull</code>.')}</p>` : !info.asset ? `<p>${T('The release contains no package for this system.')}</p>` : ''}
       <div class="upd-prog" style="display:none"><div class="transfer" style="padding:6px 0"><span class="nm">${T('Downloading …')}</span><span class="pct"></span><div class="bar"><i></i></div></div></div>`,
     buttons: [{ label: T('Later'), value: false, cls: 'ghost' }, { label: T('Release page'), value: 'web', cls: '' }, ...(info.asset && info.kind !== 'dev' ? [{ label: T('Install now'), value: true, cls: 'primary' }] : [])],
-  });
+  }).finally(() => { updateDialogOpen = false; });
   if (r === 'web') return api.call('shell:open', info.url);
   if (r !== true) return;
   toast(T('Downloading update …'));