Always set Sass output to expanded so CSS process is identical in dev and prod builds (#10347)

client/webpack.config.js

@@ -232,7 +232,17 @@ module.exports = function exports(env, argv) {
                 },
               },
             },
-            'sass-loader',
+            {
+              loader: 'sass-loader',
+              options: {
+                sassOptions: {
+                  // Manually set Sass output so it’s identical in production and development. See:
+                  // https://github.com/tailwindlabs/tailwindcss/issues/11027
+                  // https://github.com/webpack-contrib/sass-loader/issues/1129
+                  outputStyle: 'expanded',
+                },
+              },
+            },
           ],
         },
       ].concat(