Add TestDispatchAlert with 8 test cases covering:
- Returns false when onAlert callback is nil
- Returns false when alert is nil
- Returns false when activation state is pending
- Returns false when activation state is snoozed
- Returns false for monitor-only alerts
- Dispatches synchronously when async is false
- Dispatches asynchronously when async is true
- Clones alert before dispatch
Alerts package coverage: 83.4%→83.5%
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