fix(vault): update mood trend calculation to handle zero entries (#73)

docs: add Monica 4.x JSON import documentation

docs: add Monica 4.x JSON import documentation

chore: add .sisyphus/ to gitignore and remove tracked files

feat(web): add Monica import page in vault settings

test(e2e): add Monica import E2E test

feat(server): wire feed recording and search indexing for Monica import

feat(server): add Monica import handler with swagger annotations

feat(server): implement Monica contact import with tag/gender/date mapping

feat(server): add Monica import DTO definitions

feat(server): add Monica 4.x JSON struct definitions and test fixture

fix(ui): apply user date format preference to remaining hardcoded dates

fix(oauth): sync token to AuthProvider state after OAuth callback

fix(security): add CSRF state validation to OAuth account-binding flow

test(e2e): add OAuth account-binding E2E tests