v0.16.76 — WhatsApp formatting and reaction picker

Inbox quality-of-life

• Message bubbles now render WhatsApp text markers such as bold, _italic_, ~strikethrough~, and triple-backtick monospace formatting for both inbound and outbound chat text, while leaving customer-supplied HTML escaped.
• The message React action now opens an emoji picker with default reactions and searchable emoji options instead of immediately sending a thumbs-up. Reactions remain limited to inbound WhatsApp messages with provider IDs so the outbound payload matches Meta reaction-message constraints.