add hide all chats tab toggle

<!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Hide the "All Chats" tab from your chat folders bar. A new toggle in folder settings enables you to remove the default tab and fully customize your tab layout. When enabled, tab indices are automatically adjusted. Requires at least one user folder to be configured. <!-- review_stack_entry_start --> [](https://app.coderabbit.ai/change-stack/teidesu/inugram/pull/7) <!-- review_stack_entry_end --> <!-- end of auto-generated comment: release notes by coderabbit.ai -->