Use polymorphism instead of case statements in Native push target:
- DefaultPayload#category returns "default", #high_priority? returns false
- EventPayload#category returns "assignment"/"comment"/"card" based on action
- MentionPayload#category returns "mention", #high_priority? returns true
This simplifies the Native push target by delegating source-specific
logic to the appropriate payload classes.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Rosa Gutierrez
4f19c42958