v2026.10.13.1

## What's Changed
* feat(feature-flags): add async backend flag loading by @404Wolf in https://github.com/macro-inc/macro/pull/7985
* feat(scheduling): attach a Macro call from booking links by @git-julia in https://github.com/macro-inc/macro/pull/7995
* fix(cursor): accept grok_-prefixed Cursor API keys by @synoet in https://github.com/macro-inc/macro/pull/8001
* fix(website): make legacy chat redirects opt-in by @synoet in https://github.com/macro-inc/macro/pull/8004
* fix(desktop): include the PostHog key in Tauri release builds by @ehayes2000 in https://github.com/macro-inc/macro/pull/8003
* feat(marketing): book demos through Macro booking links by @chaitbuilds in https://github.com/macro-inc/macro/pull/7991
* fix(agents): rotate in-memory session credentials on cross-replica resume by @synoet in https://github.com/macro-inc/macro/pull/7944
* fix(filters): keep filter submenus open while the mouse heads into them by @gbirman in https://github.com/macro-inc/macro/pull/7990
* perf(email-renderer): cache computed styles during color adaptation by @synoet in https://github.com/macro-inc/macro/pull/7928
* Seanaye/fix/reduce notification payloads by @seanaye in https://github.com/macro-inc/macro/pull/7999
* fix(marketing): open the booking dialog for links with tracking parameters by @chaitbuilds in https://github.com/macro-inc/macro/pull/8009
* feat(graphql): compress subscription WebSocket frames by @seanaye in https://github.com/macro-inc/macro/pull/7997
* fix(icons): use calendar icon for ICS files by @gbirman in https://github.com/macro-inc/macro/pull/8007
* fix(database): open drafts immediately and avoid refresh races by @404Wolf in https://github.com/macro-inc/macro/pull/7994


**Full Changelog**: https://github.com/macro-inc/macro/compare/v2026.10.13.0...v2026.10.13.1