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### Summary by CodeRabbit
- New Feature: Updated WhatsApp logo with a new design and color scheme.
- New Feature: Added a help button in the UI linking to documentation,
enhancing user guidance.
- New Feature: Introduced an alert message indicating that the WhatsApp
integration is in beta testing.
- New Feature: Implemented a button to open WhatsApp Web directly from
the application, improving user convenience.
- Refactor: Adjusted the retrieval of `contactPhoneNumber` in
`receiveMessagePreview` function for better data structure
compatibility.
- Refactor: Optimized the initialization and management of the WhatsApp
session in `startWhatsAppPreview`.
- Refactor: Improved the `parseButtonsReply` function by refining
condition checks.
- Refactor: Enhanced the readability of serialized rich text in
`convertRichTextToWhatsAppText` by introducing newline characters.
- Bug Fix: Ensured preservation of `contact` information when resuming
the WhatsApp flow in `resumeWhatsAppFlow`.
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