Fix/build date dns error (#5945)

* Revert "fix(classic): fix classic web build failures"

This reverts commit 997926bbe1.

* fix(classic): use available Slack icon export

web/classic/rsbuild.config.ts

@@ -10,10 +10,6 @@ const semiUiDir = path.resolve(
   path.dirname(require.resolve('@douyinfe/semi-ui')),
   '../..',
 )
-const semiDateFnsDir = path.resolve(
-  semiUiDir,
-  '../semi-foundation/node_modules/date-fns',
-)
 
 export default defineConfig(({ envMode }) => {
   const env = loadEnv({ mode: envMode, prefixes: ['VITE_'] })
@@ -51,7 +47,6 @@ export default defineConfig(({ envMode }) => {
           semiUiDir,
           'dist/css/semi.css',
         ),
-        'date-fns': semiDateFnsDir,
       },
     },
     html: {