Fix TEST_FIXTURES_DIR path in test_helper.bash

[Copilot]

The TEST_FIXTURES_DIR variable was resolving to a non-existent top-level fixtures/ directory, causing T01.7 test to fail when looking for test-vault-populated.

Changes:

• Updated TEST_FIXTURES_DIR path in tests/helpers/test_helper.bash from ${BATS_TEST_DIRNAME}/../fixtures to ${BATS_TEST_DIRNAME}/fixtures

Since BATS_TEST_DIRNAME points to tests/ (the directory containing the .bats file), the corrected path now properly resolves to tests/fixtures/ where the test fixtures are actually located.

# Before: resolves to fixtures/ (non-existent)
export TEST_FIXTURES_DIR="${BATS_TEST_DIRNAME}/../fixtures"

# After: resolves to tests/fixtures/ (correct)
export TEST_FIXTURES_DIR="${BATS_TEST_DIRNAME}/fixtures"

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