Feature Request: Recurring smart alarm with selectable days (persistent schedule)

[gerageragarza-prog]

Summary

Add the ability to schedule the smart alarm (the one that buzzes the band) on selected days of the week, so it persists automatically instead of having to be set manually every single time.

Motivation

Right now the smart alarm has to be manually configured each time you want to use it. For anyone using it as a daily/weekly routine (e.g. workdays only, or every day), this means re-entering the same settings over and over. A recurring schedule would make it behave like a normal alarm clock — set it once, pick the days, and it just runs on its own from then on.

Proposed behavior

• Allow selecting specific days of the week (Mon–Sun) for the alarm to repeat on
• Once configured, the alarm stays active on those days without needing to be re-set manually
• Support multiple saved alarms with independent day schedules (e.g. one for weekdays, one for weekends)
• Ability to toggle a scheduled alarm on/off without deleting its configuration
• Keep the existing one-time/manual alarm option available for people who just want a single wake-up, alongside the new recurring option

Alternatives considered

A single "repeat daily" toggle would cover the simplest case, but per-day selection is more useful since a lot of users don't want the alarm on weekends or on specific days.

Additional context

This is a UI/scheduling feature — shouldn't require any new BLE/protocol work since the underlying "buzz the band" mechanism already exists. Likely belongs in lib/ui/ and lib/state/ (AppState) per the repo layout.