move scss files to core-styles package

apps/app/src/styles/_dropdown.scss

@@ -1,16 +0,0 @@
-@use '@growi/core-styles/scss/bootstrap/init' as bs;
-
-
-// == Colors
-@include bs.color-mode(light) {
-  .dropdown-item:active{
-    --bs-dropdown-link-active-color: #{( bs.$gray-600 )};
-    --bs-dropdown-link-active-bg: #{( bs.$gray-200 )};
-  }
-}
-
-@include bs.color-mode(dark) {
-  .dropdown-item:active{
-    --bs-dropdown-link-active-bg: #{( bs.$gray-700 )};
-  }
-}

apps/app/src/styles/style-app.scss

@@ -26,7 +26,6 @@
 @import 'modal';
 @import 'share-link';
 @import 'marker';
-@import 'dropdown';
 
 /*
  * for Guest User Mode

packages/core-styles/scss/bootstrap/theming/_dropdown-dark.scss

@@ -0,0 +1,5 @@
+@use '@growi/core-styles/scss/bootstrap/init' as bs;
+
+.dropdown-item:active{
+  --bs-dropdown-link-active-bg: #{( bs.$gray-700 )};
+}

packages/core-styles/scss/bootstrap/theming/_dropdown-light.scss

@@ -0,0 +1,6 @@
+@use '@growi/core-styles/scss/bootstrap/init' as bs;
+
+.dropdown-item:active{
+  --bs-dropdown-link-active-color: #{( bs.$gray-600 )};
+  --bs-dropdown-link-active-bg: #{( bs.$gray-200 )};
+}

packages/core-styles/scss/bootstrap/theming/apply-dark.scss

@@ -5,3 +5,4 @@
 @import './pagination';
 @import './progress';
 @import './list-group';
+@import './dropdown-dark';

packages/core-styles/scss/bootstrap/theming/apply-light.scss

@@ -5,3 +5,4 @@
 @import './pagination';
 @import './progress';
 @import './list-group';
+@import './dropdown-light';