feat: improve header and add calendar button

auth.css

@@ -117,14 +117,108 @@
 .user-details {
     display: flex;
     align-items: center;
-    gap: 10px;
+    gap: 15px;
+    flex-wrap: wrap;
 }
 
 .user-details span {
     font-weight: 500;
     font-size: 0.9rem;
+    white-space: nowrap;
 }
 
+/* Header buttons container */
+.header-buttons {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+/* Header button styles */
+.header-btn {
+    padding: 6px 12px;
+    background: rgba(255, 255, 255, 0.2);
+    color: white;
+    border: 1px solid rgba(255, 255, 255, 0.3);
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 0.8rem;
+    transition: all 0.3s ease;
+    backdrop-filter: blur(10px);
+    white-space: nowrap;
+    min-height: 32px;
+}
+
+.header-btn:hover {
+    background: rgba(255, 255, 255, 0.3);
+    transform: translateY(-1px);
+}
+
+.header-btn.logout:hover {
+    background: rgba(255, 107, 107, 0.3);
+    border-color: rgba(255, 107, 107, 0.5);
+}
+
+/* Mobile menu toggle button */
+.mobile-menu-toggle {
+    display: none;
+    padding: 8px 12px;
+    background: rgba(255, 255, 255, 0.2);
+    color: white;
+    border: 1px solid rgba(255, 255, 255, 0.3);
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 1.2rem;
+    transition: all 0.3s ease;
+    backdrop-filter: blur(10px);
+}
+
+.mobile-menu-toggle:hover {
+    background: rgba(255, 255, 255, 0.3);
+}
+
+/* Mobile dropdown menu */
+.mobile-menu {
+    position: absolute;
+    top: 100%;
+    right: 0;
+    background: rgba(103, 126, 234, 0.95);
+    backdrop-filter: blur(15px);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    border-radius: 8px;
+    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
+    z-index: 1000;
+    min-width: 160px;
+    margin-top: 8px;
+}
+
+.mobile-menu-item {
+    display: block;
+    width: 100%;
+    padding: 12px 16px;
+    background: transparent;
+    color: white;
+    border: none;
+    text-align: left;
+    cursor: pointer;
+    font-size: 0.9rem;
+    transition: all 0.2s ease;
+    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.mobile-menu-item:last-child {
+    border-bottom: none;
+}
+
+.mobile-menu-item:hover {
+    background: rgba(255, 255, 255, 0.2);
+}
+
+.mobile-menu-item.logout:hover {
+    background: rgba(255, 107, 107, 0.3);
+}
+
+/* Legacy support for existing logout-btn class */
 .logout-btn {
     padding: 6px 12px;
     background: rgba(255, 255, 255, 0.2);
@@ -201,11 +295,13 @@
 @media (max-width: 768px) {
     .auth-header {
         padding: 10px 0;
+        position: relative;
     }
 
     .auth-container {
         min-height: 45px;
         padding: 0 12px;
+        position: relative;
     }
     
     .logo {
@@ -216,13 +312,18 @@
         font-size: 1.1rem;
     }
     
-    .auth-section,
-    .user-info {
+    .auth-section {
         order: 2;
         width: 100%;
         justify-content: center;
     }
     
+    .user-info {
+        order: 2;
+        position: relative;
+        width: auto;
+    }
+    
     .auth-form,
     .settings-form {
         min-width: 280px;
@@ -230,6 +331,52 @@
     }
     
     .user-details {
-        gap: 8px;
+        gap: 10px;
+        position: relative;
+    }
+    
+    .user-details span {
+        font-size: 0.8rem;
+    }
+    
+    /* Hide desktop buttons on mobile */
+    .header-buttons {
+        display: none;
+    }
+    
+    /* Show mobile menu toggle */
+    .mobile-menu-toggle {
+        display: block !important;
+    }
+    
+    /* Ensure mobile menu appears correctly */
+    .mobile-menu {
+        right: 0;
+        width: 180px;
+    }
+}
+
+/* For very small screens */
+@media (max-width: 480px) {
+    .auth-container {
+        padding: 0 8px;
+        flex-wrap: wrap;
+        justify-content: space-between;
+    }
+    
+    .user-details span {
+        font-size: 0.75rem;
+        max-width: 150px;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    
+    .mobile-menu {
+        width: 160px;
+        right: -10px;
+    }
+    
+    .logo h2 {
+        font-size: 1rem;
     }
 }