- Add ChannelManager class for notification channel management
- Implement channel existence checking and creation
- Add channel importance validation (guards against IMPORTANCE_NONE)
- Add deep link to channel settings when notifications are blocked
- Integrate channel manager into plugin load() method
- Add new plugin methods: isChannelEnabled(), openChannelSettings(), checkStatus()
- Add comprehensive status checking including permissions and channel state
- Add test app UI for channel management testing
P0 Priority Implementation:
- Guards against channel = NONE (blocked notifications)
- Provides actionable error messages with deep links to settings
- Ensures notifications can actually be delivered
- Comprehensive status checking for all notification requirements
This addresses the critical issue where notifications are scheduled
but silently dropped due to blocked notification channels.
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