Add QR Code for Keypasses

src/static/app.js

@@ -204,6 +204,30 @@ document.getElementById("logout-btn").addEventListener("click", () => {
 
 // ── Init ──────────────────────────────────────────────────────────────────────
 (function init() {
+  // Auto-login when the URL contains ?k=CODE (e.g. scanned from a QR code)
+  const params = new URLSearchParams(window.location.search);
+  const k = params.get("k");
+  if (k) {
+    // Remove the code from the URL immediately so it doesn't linger in history
+    history.replaceState(null, "", window.location.pathname);
+    fetch("/api/auth/keypass", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ code: k.toUpperCase() }),
+    })
+      .then(res => res.ok ? res.json() : Promise.reject())
+      .then(data => {
+        saveToken(data.token);
+        showGatesView();
+        loadGates();
+      })
+      .catch(() => {
+        clearToken();
+        showLogin();
+      });
+    return;
+  }
+
   const t = getToken();
   if (tokenValid(t)) {
     showGatesView();