Per-email threads visibility toggle (shared / private)

Per-email visibility toggle (shared / private) Problem Currently, email visibility in Twenty is configured at the account (message channel) level — users choose one of three options globally: • Metadata only • Subject + Metadata • All Email Content This creates a real-world privacy problem: a connected mailbox contains both business-relevant emails (client conversations, deals, proposals) and personal or sensitive emails (service registrations, password resets, bank notifications, 2FA codes, SaaS onboarding emails, etc.). With the current global setting, users must choose between: • Sharing everything with the team (including sensitive content), or • Sharing nothing (losing the collaborative value of email sync entirely) There is no middle ground. Proposed Solution Add a per-email (per-thread) visibility toggle that allows users to explicitly mark individual email threads as shared with the workspace — defaulting to pri…