feat: Introduce a new lander-v2 page, enhance database reset functionality with session state invalidation, and update core conversation logic, profiles, and prompts.

refactor: Update terminology from "health companion" to "care companion" across the application.

feat: Introduce voice-guided onboarding demo with new screenshot styling and enhance ConfirmationCard UI.

feat: Implement fullscreen UI for components like HeadacheLog and enhance headache logging with a step-by-step wizard, alongside broadcasting tool start events.

initial commit