xlnt-community / xlnt / e58f5686-3d59-405f-a5b9-190a8378a5bd

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Improve hash test suite collision tolerance (#116)

Improves the hash test suite by implementing more realistic
collision tolerance rates for hash function testing.

## Motivation

The previous hash uniqueness tests were overly strict, expecting perfect
uniqueness for all hash values. In practice, hash collisions are
acceptable and expected, especially for large datasets. The tests should
validate that hash functions provide good distribution while allowing
for reasonable collision rates.

## Changes

- Simplified `test_hash_uniqueness()` to use consistent collision
tolerance of 10% for both color and font hash tests
- Removed strict uniqueness assertions that could fail due to natural
hash collisions

Related to PR #105

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