Implement early access handling and UI enhancements for LoRA downloads

- Added error handling for early access restrictions in the API routes, returning appropriate status codes and messages.
- Enhanced the Civitai client to log unauthorized access attempts and provide user-friendly error messages.
- Updated the download manager to check for early access requirements and log warnings accordingly.
- Introduced UI elements to indicate early access status for LoRAs, including badges and warning messages in the import manager.
- Improved toast notifications to inform users about early access download failures and provide relevant information.

static/css/components/toast.css

@@ -120,4 +120,63 @@
 
 .tooltip:hover::after {
     opacity: 1;
+}
+
+/* Toast Container for stacked notifications */
+.toast-container {
+    position: fixed;
+    top: 0;
+    right: 0;
+    z-index: calc(var(--z-overlay) + 10);
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    padding: 20px;
+    pointer-events: none; /* Allow clicking through the container */
+    width: 400px;
+    max-width: 100%;
+}
+
+/* Ensure each toast has pointer events */
+.toast-container .toast {
+    pointer-events: auto;
+    position: relative; /* Override fixed positioning */
+    top: 0 !important; /* Let the container handle positioning */
+    right: 0 !important;
+    margin-bottom: 10px;
+}
+
+/* Add missing warning toast style */
+.toast-warning {
+    border-left: 4px solid var(--lora-warning);
+}
+
+.toast-warning::before {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23ff9800'%3E%3Cpath d='M1 21h22L12 2 1 21zm12-3h-2v-2h2v2zm0-4h-2v-4h2v4z'/%3E%3C/svg%3E");
+}
+
+/* Improve toast animation */
+.toast {
+    transform: translateX(120%);
+    opacity: 0;
+    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
+                opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.toast.show {
+    transform: translateX(0);
+    opacity: 1;
+}
+
+/* Responsive adjustments */
+@media (max-width: 480px) {
+    .toast-container {
+        width: 100%;
+        padding: 10px;
+    }
+    
+    .toast {
+        width: 100%;
+        max-width: none;
+    }
 }