Improve tab scrolling with arrows

frontend/src/styles/Layout.css

@@ -62,6 +62,7 @@ body {
   -webkit-overflow-scrolling: touch;
   scrollbar-width: none;
   -ms-overflow-style: none;
+  scroll-behavior: smooth;
 }
 
 .page-tabs-slider::-webkit-scrollbar,
@@ -69,6 +70,102 @@ body {
   display: none;
 }
 
+.tabs-scroll-shell {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  max-width: 100%;
+  min-width: 0;
+}
+
+.tabs-scroll-slider {
+  cursor: grab;
+  overscroll-behavior-x: contain;
+  min-width: 0;
+}
+
+.tabs-scroll-slider--dragging {
+  cursor: grabbing;
+  user-select: none;
+}
+
+.tabs-scroll-arrow {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 34px;
+  height: 34px;
+  border-radius: 999px;
+  border: 1px solid var(--color-border);
+  background: var(--color-bg-elevated);
+  color: var(--color-text-secondary);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: var(--shadow-md);
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.2s ease, transform 0.2s ease, background 0.2s ease, color 0.2s ease;
+  z-index: 2;
+}
+
+.tabs-scroll-arrow .material-symbols-outlined {
+  font-size: 20px;
+}
+
+.tabs-scroll-arrow.visible {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+.tabs-scroll-arrow:hover {
+  background: var(--color-bg-card);
+  color: var(--color-text-primary);
+}
+
+.tabs-scroll-arrow:active {
+  transform: translateY(-50%) scale(0.96);
+}
+
+.tabs-scroll-arrow.left {
+  left: -12px;
+}
+
+.tabs-scroll-arrow.right {
+  right: -12px;
+}
+
+@media (max-width: 1024px) {
+  .tabs-scroll-slider {
+    touch-action: pan-x;
+  }
+}
+
+@media (max-width: 768px) {
+  .tabs-scroll-arrow {
+    width: 30px;
+    height: 30px;
+  }
+
+  .tabs-scroll-arrow.left {
+    left: -8px;
+  }
+
+  .tabs-scroll-arrow.right {
+    right: -8px;
+  }
+}
+
+@media (max-width: 480px) {
+  .tabs-scroll-arrow.left {
+    left: -6px;
+  }
+
+  .tabs-scroll-arrow.right {
+    right: -6px;
+  }
+}
+
 @supports (color: color-mix(in srgb, black, white)) {
   .page-tabs-slider,
   .admin-tabs-slider {