Sync Mode6Test frontend improvements: pinch zoom 500% max, no flicker/flip, deferred rendering

frontend/auth.js

@@ -0,0 +1,39 @@
+// PocketBase auth bootstrap shared by pages
+(function (global) {
+  const pb = new PocketBase('https://pocketbase.ccllc.pro');
+
+  function authHeaders() {
+    if (pb.authStore.isValid && pb.authStore.token) {
+      return { Authorization: `Bearer ${pb.authStore.token}` };
+    }
+    return {};
+  }
+
+  function getDisplayName() {
+    const model = pb.authStore.model || {};
+    return (
+      model.display_name ||
+      model.name ||
+      model.email ||
+      model.username ||
+      'Unknown'
+    );
+  }
+
+  function getEmail() {
+    const model = pb.authStore.model || {};
+    // Prefer email, but fall back to username if email missing
+    return model.email || model.username || null;
+  }
+
+  async function ensureAuth() {
+    if (pb.authStore.isValid) return true;
+    const path = new URL(window.location.href).pathname;
+    if (!path.endsWith('signin.html')) {
+      window.location.href = 'signin.html';
+    }
+    return false;
+  }
+
+  global.Auth = { pb, authHeaders, ensureAuth, getDisplayName, getEmail };
+})(window);