style: z-index 수정

Author: BHyeonKim

src/components/layout/Navigation/navigation.module.scss

@@ -4,7 +4,7 @@
 
 .navigation {
   position: fixed;
-  z-index: dimensions.$modal;
+  z-index: dimensions.$foreground;
   display: flex;
   gap: 30px;
   align-items: center;

src/features/search/AutoSearch/autoSearch.module.scss

@@ -3,7 +3,7 @@
 
 .container {
   position: absolute;
-  z-index: 2000;
+  z-index: 49;
   display: flex;
   flex-direction: column;
   justify-content: center;