Role mentions in meeting notes

Chronote notes can now mention server roles, not just individual members, so work assigned to a group reads as that group.

What changed

• Notes mention a role when the transcript assigns work to a team rather than to one person.
• Member and role mentions can appear anywhere in the notes, not only in action item sections.
• Chronote only mentions roles that exist in your server, and never produces an @everyone or @here mention. Mentions are checked against your server's members and roles before notes are saved.
• The web portal, shared links, Notion exports, and Markdown exports now show role mentions as readable role names.
• Notion exports previously showed raw member ids in place of mentions. They now show readable names.

What did not change

Mentions in meeting notes remain display-only. Discord does not notify anyone for mentions inside an embed, so posting notes never pings a member or a role.