Admin activity pages through the log and filters by a recorded actor

Admin activity now reads like a list you can walk through and share.

• Pages of 50. Previous and Next sit under the table, next to a range such as 1–50 of 1,234. Past 10,000 matching entries it reads of more than 10,000.
• Pick an actor instead of typing one. The Actor filter lists everyone recorded in your log, members who have left and revoked API keys included, plus System. Typing part of a name or an email to match several people is gone.
• Three columns sort: Date, Action and Source. Site, Actor and Target no longer sort; Site and Actor have their own filters.
• The view lives in the address. Filters, sort and page survive a reload and can be shared with a colleague who has the same access. Reset clears them. A link to a page that no longer exists opens the first page of the same view.
• Export CSV is unchanged: it still downloads every entry matching your filters, newest first, up to 5,000 rows.

If you read lists through the REST API or the MCP server, their cursors changed format. A cursor saved before this release gets invalid_cursor once: start again without a cursor. Requests and responses are otherwise unchanged.