feat: add rivers overview component and sync lake volume data across the dataset

src/App.css

@@ -13,8 +13,12 @@
   display: flex;
   flex-direction: column;
   padding: 1.5rem 0.75rem;
-  transition: width 0.3s ease;
+  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1),
+              padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
   overflow: hidden;
+  flex-shrink: 0;
+  will-change: width;
+  z-index: 100;
 }
 
 .sidebar.collapsed {
@@ -22,8 +26,19 @@
   padding: 1.5rem 0.5rem;
 }
 
+.sidebar-text {
+  opacity: 1;
+  max-width: 150px;
+  overflow: hidden;
+  white-space: nowrap;
+  transition: opacity 0.15s ease, max-width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+  pointer-events: auto;
+}
+
 .sidebar.collapsed .sidebar-text {
-  display: none;
+  opacity: 0;
+  max-width: 0;
+  pointer-events: none;
 }
 
 .sidebar.collapsed .sidebar-logo {
@@ -358,6 +373,7 @@
   }
 
   .main-content {
+    margin-left: 0 !important;
     padding: 1rem;
     gap: 1rem;
   }