v6.4.1 - Calendar timetable and pending work

Today now follows the local calendar. Yesterday and older unfinished work appear separately, completed work stays recorded, and tomorrow is a read-only preview. Completing today no longer advances into a future timetable.

Daily study capacity is visible during setup, stream cards support the keyboard, and secondary plan tools sit below the study task. Guest plans no longer trigger automatic sign-in popups after creation or recovery. Open sections survive background redraws. The floating focus controls remain available pending the maintainer's requested follow-up.

This release also fixes first-visit offline hydration by precaching built bundles, corrects stale public metrics and project documentation, and updates CI and Pages deployment.

Validation: lint, 101 unit tests, 553 engine checks, six synthetic scheduler benchmarks, production build and five Chromium browser tests. The published CI and Pages workflows passed for commit 3b5da2d. These checks do not establish independent adoption, curriculum accuracy or educational outcomes.

Live app: https://mission-plustwo.web.app/
Validation record: docs/VALIDATION-6.4.1.md