Summary

• add Angular route title metadata for the main Runbox sub-app routes
• cover Mail, Compose, Overview, Welcome, Calendar, Contacts, Account, Help, DKIM, Changelog, Onscreen, Domain Registration, and Login routes
• use Angular 16 native route titles instead of adding a custom router listener

Closes #284

Verification

• git diff --check
• node --check src/app/app.module.ts

Not run

• npm/ng build or tests: the local system Node/npm install is broken on this machine, and the bundled runtime available here includes node but not npm.