feat: add web batch bulk operations

src/GmRelay.Web/wwwroot/app.css

@@ -1,5 +1,5 @@
 /* ============================================
-   GM-Relay Design System v1.3.0
+   GM-Relay Design System v1.4.0
    Dark RPG Dashboard Theme
    ============================================ */
 
@@ -553,6 +553,66 @@ input[type="datetime-local"]::-webkit-calendar-picker-indicator {
     gap: 1rem;
 }
 
+/* === Batch bulk operations === */
+.batch-bulk-grid {
+    display: grid;
+    gap: 1rem;
+    margin-bottom: 1.5rem;
+}
+
+.batch-bulk-card {
+    background: var(--glass-bg);
+    backdrop-filter: blur(var(--glass-blur));
+    -webkit-backdrop-filter: blur(var(--glass-blur));
+    border: 1px solid var(--glass-border);
+    border-radius: var(--radius-md);
+    padding: 1.25rem;
+}
+
+.batch-bulk-header {
+    display: flex;
+    justify-content: space-between;
+    gap: 1rem;
+    align-items: flex-start;
+    margin-bottom: 1rem;
+}
+
+.batch-bulk-header h3 {
+    font-size: 1rem;
+    margin-bottom: 0.25rem;
+    overflow-wrap: anywhere;
+}
+
+.batch-bulk-header p {
+    margin: 0;
+    color: var(--text-muted);
+    font-size: 0.8125rem;
+}
+
+.batch-bulk-fields {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 0.75rem;
+}
+
+.batch-bulk-divider {
+    height: 1px;
+    background: var(--border-color);
+    margin: 1rem 0;
+}
+
+.batch-clone-row {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) auto;
+    gap: 0.75rem;
+    align-items: center;
+    margin-top: 1rem;
+}
+
+.batch-clone-row .btn-gm {
+    white-space: nowrap;
+}
+
 /* === Animations === */
 @keyframes fadeIn {
     from { opacity: 0; transform: translateY(8px); }
@@ -772,6 +832,16 @@ input[type="datetime-local"]::-webkit-calendar-picker-indicator {
         grid-template-columns: 1fr;
     }
 
+    .batch-bulk-fields,
+    .batch-clone-row {
+        grid-template-columns: 1fr;
+    }
+
+    .batch-clone-row .btn-gm {
+        justify-content: center;
+        width: 100%;
+    }
+
     .page-container {
         padding: 1rem;
     }