Add a visual status indicator showing:
- Online/offline status with colored dot indicator
- Last seen timestamp
- Typical wake time (if available)
The indicator now displays whenever Discord notifications are enabled,
not just when presence tracking is active.
The API requires adaptive_mode when adaptive_timing_enabled is true,
but the frontend was only sending the enabled flag. This caused 400
errors when users tried to toggle adaptive timing on.
Now the toggle sends both fields when enabling, satisfying the API
validation requirements.
Uses the existing bot token to send DMs to users by their Discord user ID
instead of posting to a channel webhook.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
