feat: add config for custom page/tab title

[chloebyun-wd]

Add config to add optional customizable tab/page title.

pageTitle set:

nothing set:

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new configuration option to allow users to customize the browser tab or page title when embedding the chatbot widget. This enhancement provides greater control over the user interface and branding, enabling the chatbot to seamlessly integrate with the host application's identity by displaying a relevant and custom title.

Highlights

• Customizable Page/Tab Title: Introduced a new optional configuration option, pageTitle, allowing users to set a custom browser tab or page title for the embedded chatbot widget.
• Default Fallback: The pageTitle will default to 'Flowise Chatbot Widget' if an empty string is provided, ensuring a consistent title even when customization is attempted with an empty value.
• API and Type Definition Updates: Updated the BotProps interface and the initFull and init functions to accept the new pageTitle parameter, ensuring type safety and proper integration.
• Documentation Update: The README.md file was updated to include an example of how to use the new pageTitle configuration.

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[gemini-code-assist]

Code Review

This pull request introduces a new pageTitle option for the chatbot widget, allowing users to customize the browser tab title. The implementation includes updating the BotProps type and adding an applyPageTitle function that sets the document title, falling back to a default if no title is provided. A high-severity issue was identified where the applyPageTitle function's check for pageTitle is not robust enough, potentially leading to a TypeError if pageTitle is explicitly null instead of undefined. The suggested fix is to use pageTitle == null for a more comprehensive check.