ClearChat Home v1.5.6 RC7 - Final Test Fixes

- Adds phone number display to offline-form conversations.
- Shows the privacy notice link in active online chats.
- Removes embed code from the Conversation Inbox page.
- Updates installer version text/default installed_version.
- Updates clean database schema with visitor phone/source fields.
- Adds privacy URL and permissions guidance to Help documentation.
- Bumps displayed app version to 1.5.6-rc7-home.
