Feat: Upload files in the chat box on the agent page #3221 (#9035)

### What problem does this PR solve?

Feat: Upload files in the chat box on the agent page #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form/agent-form/index.tsx

@@ -150,7 +150,8 @@ function AgentForm({ node }: INextOperatorForm) {
           <FormContainer>
             <QueryVariable
               name="visual_files_var"
-              label="Visual files var"
+              label="Visual Input File"
+              type={VariableType.File}
             ></QueryVariable>
             <FormField
               control={form.control}