实现 Codex 风格上下文压缩时间线交互

src/styles/globals.css

@@ -737,6 +737,31 @@ html[data-ui-language='ru'] {
   will-change: opacity, transform;
 }
 
+@keyframes context-compaction-shimmer {
+  from {
+    background-position: 100% 50%;
+  }
+
+  to {
+    background-position: -100% 50%;
+  }
+}
+
+.context-compaction-shimmer {
+  color: transparent;
+  background-image: linear-gradient(
+    100deg,
+    hsl(var(--muted-foreground) / 0.58) 25%,
+    hsl(var(--foreground) / 0.78) 50%,
+    hsl(var(--muted-foreground) / 0.58) 75%
+  );
+  background-position: 100% 50%;
+  background-size: 200% 100%;
+  background-clip: text;
+  animation: context-compaction-shimmer 2.4s linear infinite;
+  -webkit-background-clip: text;
+}
+
 @media (prefers-reduced-motion: reduce) {
   *,
   *::before,
@@ -770,4 +795,10 @@ html[data-ui-language='ru'] {
     transform: scaleY(1);
   }
 
+  .context-compaction-shimmer {
+    color: hsl(var(--muted-foreground));
+    background-image: none;
+    animation: none;
+  }
+
 }