fix(styles): remove scss variables manual overriding

apps/client/src/styles.scss

@@ -256,13 +256,6 @@ body {
       --mat-card-outlined-container-color: var(--dark-background);
     }
 
-    .mat-mdc-fab {
-      &.mat-primary {
-        --mat-fab-icon-color: rgba(var(--dark-primary-text));
-        --mat-mdc-fab-color: rgba(var(--dark-primary-text));
-      }
-    }
-
     .mat-mdc-paginator {
       background-color: rgba(var(--palette-foreground-base-dark), 0.02);
     }
@@ -439,15 +432,6 @@ ngx-skeleton-loader {
   }
 }
 
-.mat-mdc-fab {
-  color: var(--mat-mdc-fab-color, inherit) !important;
-
-  &.mat-primary {
-    --mat-fab-icon-color: rgba(var(--light-primary-text));
-    --mat-mdc-fab-color: rgba(var(--light-primary-text));
-  }
-}
-
 .mat-mdc-form-field {
   &.without-hint {
     .mat-mdc-form-field-subscript-wrapper {