🚸 (whatsapp) Improve how the whatsapp preview behaves (#873)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
### 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`.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/bot-engine/whatsapp/convertRichTextToWhatsAppText.ts

@@ -6,4 +6,4 @@ export const convertRichTextToWhatsAppText = (richText: TElement[]): string =>
     .map((chunk) =>
       serialize(chunk)?.replaceAll('**', '*').replaceAll(''', "'")
     )
-    .join('')
+    .join('\n')

packages/bot-engine/whatsapp/resumeWhatsAppFlow.ts

@@ -67,7 +67,7 @@ export const resumeWhatsAppFlow = async ({
     session && !isSessionExpired
       ? session.state.currentBlock
         ? await continueBotFlow(session.state)(messageContent)
-        : await startBotFlow(session.state)
+        : await startBotFlow({ ...session.state, whatsApp: { contact } })
       : workspaceId
       ? await startWhatsAppSession({
           incomingMessage: messageContent,