chore: update Connect SDK to beta68

[callumalpass]

Summary

• pin all immutable Connect SDK artifacts to beta68 merge 86085d2335a8cd46fe21ba178815aeaea7479e90
• keep the coordinated consumer artifact manifest consistent
• deploy the verified staging build

Verification

• format, typecheck, lint, unit and coverage suites
• mdbase contract/conformance, production build and manifest checks
• 20 desktop/mobile browser tests
• Android Gradle test, lint and assemble; notification channel, FCM registration, foreground push and restart
• post-deploy authenticated beta68 create/read/list/update/delete acceptance at desktop and 390×844, with zero console errors
• collection deletion/revocation returned the app to its expected reconnect state

Staging: https://staging.tasknotes-app.pages.dev/
Preview: https://c303f998.tasknotes-app.pages.dev