Show projected Pomodoro end time

[abbiefalls90]

Summary

• display the projected local finish time while a Pomodoro is running
• derive the finish time from the existing in-memory remaining duration without persisting new metadata
• respect the configured 12- or 24-hour time format and update translations

Closes #2006

Testing

• npm test -- --runInBand tests/unit/utils/pomodoroTime.test.ts
• npm run lint
• npm run typecheck
• npm run build
• npm run build:test
• npm run i18n:verify
• npm run i18n:check-usage
• npm test -- --runInBand completed with 612 suites passing and 11 existing suites failing; the same 21 failures reproduce on untouched upstream/main in this environment

Obsidian CLI runtime reload was not available because no vault named test is registered on this machine.

[abbiefalls90]

Thank you for a great plugin!