- Refactored SRS pair validation logic by introducing the `_isTrainableSrsPair` method to enhance the criteria for acceptable learning and reference pairs.
- Added `_isInstructionLikeText` method to filter out instructional texts from SRS pairs, improving the quality of vocabulary training.
- Updated various methods to utilize the new validation logic, ensuring consistent handling of vocabulary entries across the service.
- Enhanced the `_courseHasDueSrsItems` and `_extractTrainerVocabsFromLessonDidactics` methods to improve data retrieval and filtering based on the new criteria.
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