feat: refactor TopLoader to use a hook for active state management and improve CSS for fixed positioning

distribution_fe/app/globals.css

@@ -135,42 +135,44 @@
   border-bottom-color: var(--muted-foreground);
 }
 
-/* Top loading strip: thin bar sliding across with a neon-red leading dot. */
+/* Top loading strip: fixed-at-top-of-viewport bar sliding across with a
+   neon-red leading dot. Fixed positioning so no scroll container can clip it. */
 .top-loader {
   pointer-events: none;
-  position: absolute;
+  position: fixed;
   left: 0;
   right: 0;
   top: 0;
   height: 2px;
   overflow: visible;
-  z-index: 50;
+  z-index: 100;
 }
 .top-loader__bar {
   position: absolute;
   inset: 0;
   background: linear-gradient(
     90deg,
-    transparent 0%,
-    rgba(255, 60, 90, 0.35) 55%,
-    rgba(255, 90, 120, 0.9) 90%,
+    rgba(255, 46, 99, 0.0) 0%,
+    rgba(255, 46, 99, 0.85) 40%,
+    rgba(255, 90, 120, 1) 80%,
     #ff2e63 100%
   );
   transform: translateX(-100%);
-  animation: top-loader-slide 1.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
+  animation: top-loader-slide 1.1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
+  box-shadow: 0 0 8px rgba(255, 46, 99, 0.45);
 }
 .top-loader__head {
   position: absolute;
-  right: -4px;
+  right: -2px;
   top: -2px;
   height: 6px;
   width: 10px;
   border-radius: 9999px;
-  background: #ff6b8a;
+  background: #ffd1dc;
   box-shadow:
     0 0 6px 1px #ff2e63,
-    0 0 14px 2px rgba(255, 46, 99, 0.75),
-    0 0 24px 4px rgba(255, 46, 99, 0.35);
+    0 0 14px 3px rgba(255, 46, 99, 0.85),
+    0 0 28px 6px rgba(255, 46, 99, 0.45);
 }
 @keyframes top-loader-slide {
   0%   { transform: translateX(-100%); }