fix(dataset, next-chats): Fix data form data acquisition logic And Optimize the chat settings interface and add language selection (#9629)

### What problem does this PR solve?

fix(dataset): data form data acquisition logic
fix(next-chats): Optimize the chat settings interface and add language
selection

- Replace form.formControl.trigger with form.trigger
- Use form.getValues() instead of form.formState.values
- Add language selection to support multiple languages
- Add default chat settings values
- Add new settings: icon, description, knowledge base ID, etc.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

web/src/pages/next-chats/chat/app-settings/use-chat-setting-schema.tsx

@@ -34,11 +34,11 @@ export function useChatSettingSchema() {
     name: z.string().min(1, { message: t('assistantNameMessage') }),
     icon: z.array(z.instanceof(File)),
     language: z.string().min(1, {
-      message: 'Username must be at least 2 characters.',
+      message: t('languageMessage'),
     }),
-    description: z.string(),
+    description: z.string().optional(),
     kb_ids: z.array(z.string()).min(0, {
-      message: 'Username must be at least 1 characters.',
+      message: t('knowledgeBasesMessage'),
     }),
     prompt_config: promptConfigSchema,
     ...rerankFormSchema,