Idrinth / habit-evaluator / 22345515294

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Fix activity-group assignment not persisting due to lazy loading with open-in-view=false (#614)

PlannerActivity.groups used FetchType.LAZY, but with spring.jpa.open-in-view=false
the Hibernate session closes after each repository call. This caused the groups
collection to be uninitialized when serialized to JSON, making it appear as though
group assignments were never saved.

Changed groups fetch type to EAGER (consistent with Habit.entries/category) and
added LEFT JOIN FETCH to JPA queries for efficient single-query loading.

https://claude.ai/code/session_01EU652s3fhMA1G6jMLXXBP1

Co-authored-by: Claude <noreply@anthropic.com>

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