Fix: white hover line overflow on critical path segments (jaegertracing#3550)

### Before:

https://github.com/user-attachments/assets/10977639-2641-4c0d-9e38-b5b184f47359

### After:

https://github.com/user-attachments/assets/075522fe-d50c-4a25-8b94-ec034480727f

Signed-off-by: Parship Chowdhury <parshipchowdhury@gmail.com>

Author: Parship12

packages/jaeger-ui/src/components/TracePage/TraceTimelineViewer/SpanBar.css

@@ -38,8 +38,7 @@ SPDX-License-Identifier: Apache-2.0
   top: 45%;
   height: 11%;
   z-index: 2;
-  overflow: visible;
-  /* Changed from hidden to show shadow */
+  overflow: hidden;
   box-shadow:
     0 -0.5px 0 var(--critical-path-outline),
     0 0.5px 0 var(--critical-path-outline);