[Bug] plugin overrides react-chatbotify themes/styles instead of merging — breaks host app styles

[kareemkhalil]

The @rcb-plugins/input-validator plugin, when imported and used, replaces/overrides the host app's react-chatbotify theme and styles (themes and styles passed to the ChatBot component). As a result the ChatBot's themes and explicit styles prop are ignored or mutated and the host UI layout/styles are broken.

Steps To Reproduce:

1. Create a ChatBot with a custom theme and explicit styles prop, for example:

// import and use HtmlRenderer + InputValidator plugins
const plugins = [ HtmlRenderer(), InputValidator(inputValidatorConfig) ];

const themes = [{ id: "minimal_midnight", version: "0.1.0" }];

<ChatBot
  flow={flow}
  themes={themes}
  plugins={plugins}
  styles={{
    chatWindowStyle: { height: "100vh", borderRadius: 0, width: "100%" },
    bodyStyle: { paddingLeft: 10, paddingRight: 10 },
    userBubbleStyle: { marginTop: 10, marginBottom: 3 }
  }}
/>

2. Run the app and observe that after adding InputValidator the specified themes and styles are overridden or ignored.
3. Check the rendered chat — the greeting repeats or layout/styling are different from expected.

Expected behavior: Plugin should not override or mutate the host ChatBot's [themes] or [styles] objects.

Library version:
0.3.0

Desktop (please complete the following information):

• OS: Windows 11
• Browser: chrome