Restore mat-elevation-z* and hover effect on selectbox #11331

Should not have trusted automated migration during Angular 19.2
migration...

Author: PowerKiKi

client/styles/_themes.scss

@@ -67,8 +67,7 @@ $ichtus-theme: mat.m2-define-light-theme(
     @include mat.card-color($theme);
     @include mat.checkbox-color($theme);
     @include mat.chips-color($theme);
-    @include mat.elevation-classes();
-    @include mat.app-background();
+    @include mat.core-color($theme);
     @include mat.datepicker-color($theme);
     @include mat.dialog-color($theme);
     @include mat.divider-color($theme);
@@ -115,8 +114,7 @@ $fake-material-v2-theme: mat.m2-define-light-theme(
 @include mat.card-base($fake-material-v2-theme);
 @include mat.checkbox-base($fake-material-v2-theme);
 @include mat.chips-base($fake-material-v2-theme);
-@include mat.elevation-classes();
-@include mat.app-background();
+@include mat.core-base($fake-material-v2-theme);
 @include mat.datepicker-base($fake-material-v2-theme);
 @include mat.dialog-base($fake-material-v2-theme);
 @include mat.divider-base($fake-material-v2-theme);
@@ -147,8 +145,7 @@ $fake-material-v2-theme: mat.m2-define-light-theme(
 @include mat.card-density(0);
 @include mat.checkbox-density(0);
 @include mat.chips-density(0);
-@include mat.elevation-classes();
-@include mat.app-background();
+@include mat.core-density(0);
 @include mat.datepicker-density(0);
 @include mat.dialog-density(0);
 @include mat.divider-density(0);
@@ -180,9 +177,7 @@ $fake-material-v2-theme: mat.m2-define-light-theme(
 @include mat.card-typography(natural.$typography);
 @include mat.checkbox-typography(natural.$typography);
 @include mat.chips-typography(natural.$typography);
-@include mat.elevation-classes();
-@include mat.app-background();
-@include mat.datepicker-typography(natural.$typography);
+@include mat.core-typography(natural.$typography) @include mat.datepicker-typography(natural.$typography);
 @include mat.dialog-typography(natural.$typography);
 @include mat.divider-typography(natural.$typography);
 @include mat.expansion-typography(natural.$typography);