[Week7 - jbk] Task4: Add pagination and sorting tests

[Candyroom136]

Summary

• Added comprehensive test suite for pagination and sorting across notes and action items
• 30 new test cases in test_pagination_sorting.py

Testing

$ make test
30+ passed

Test coverage:

• Pagination (notes & action items): limit, skip+limit, skip near end, skip beyond total
• Sorting (notes): title asc/desc, created_at asc/desc, invalid field fallback
• Sorting (action items): description asc/desc, default sort
• Validation: limit=0, limit=201, skip=-1, limit=-1 → all return 422
• Combined: pagination + sorting together

Tradeoffs & Follow-ups

• Tests rely on insertion order for created_at sorting (SQLite timestamps may have same second)
• No tests for search (q) combined with pagination/sorting

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