fix: abnormal file selector color in light theme

module/webui/styles/file_selector.css

@@ -1,15 +1,5 @@
 .file-selector-overlay {
-    display: none;
-    position: fixed;
-    top: 0;
-    left: 0;
-    width: 100vw;
-    height: 100vh;
-    background-color: rgba(0, 0, 0, 0.5);
-    transition: opacity 0.3s ease;
-    opacity: 0;
     z-index: 2000;
-    justify-content: center;
     align-items: center;
 }
 
@@ -85,7 +75,7 @@
 .file-item svg {
     flex-shrink: 0;
     margin-right: 10px;
-    fill: #ccc;
+    fill: #6E6E6E;
 }
 
 .file-item span {
@@ -113,6 +103,7 @@
         color: #C2C2C2;
     }
 
+    .file-item svg,
     .back-button {
         fill: #C2C2C2;
     }