Announce and Send Notifications for Battery Status (High, Medium, Low)

# Feature Request: Announce and Send Notifications for Battery Status (High, Medium, Low)

## Summary
The Carv app should audibly announce battery status and send notifications at key moments to help users manage battery life and avoid disappointment due to drained batteries. This feature increases user value and encourages renewals.

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## Motivation
Carv users depend on reliable hardware during limited ski trips — often just a few days each year. When batteries unexpectedly drain, users may lose skiing time, reducing their satisfaction and likelihood of renewing subscriptions.

By proactively announcing battery levels and sending notifications, Carv can help users avoid preventable downtime, improve trust, and enhance overall experience.

Notably, even inexpensive Bluetooth headphones announce “Battery High,” “Battery Medium,” or “Battery Low” on startup. This simple, effective user feedback has prevented missed use due to dead batteries — a similar approach would benefit Carv users greatly.

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## Proposed Behavior

### When “Ski Start” is pressed:
- **Audibly announce** current battery status: *High, Medium, or Low.*
- **Send notification** if battery is Low.

### When “Ski Pause” is pressed:
- **Announce and send notification** if battery is Low.

### When Bluetooth disconnects:
- If battery is Low, **announce “Battery Low”** and **send in-app notification.**

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## Benefits
- Prevent lost ski sessions due to unexpected battery drain.
- Improve user satisfaction and retention.
- Reduce support requests related to power issues.
- Increase perceived reliability of Carv hardware and app integration.

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## Business Impact
For annual subscribers who ski only a few days per year, a single lost day due to dead batteries can significantly reduce the perceived value of Carv. Adding proactive battery alerts can:
- Strengthen user trust in the product.
- Encourage subscription renewals.
- Differentiate Carv from less user-aware devices.

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## Example Reference
Bluetooth headphones use simple audible battery level cues (“Battery High/Medium/Low”) effectively. Carv can implement a similar low-cost, high-value feature to remind users to charge before skiing.