bug: test_parse_attachments_size_limit_accumulates fails with path validation error

[jpoehnelt]

Description

The test helpers::gmail::tests::test_parse_attachments_size_limit_accumulates intermittently fails with a path validation error:

thread 'helpers::gmail::tests::test_parse_attachments_size_limit_accumulates' panicked at src/helpers/gmail/mod.rs:2670:9:
error should mention exceeding limit: --attach '/path/to/.tmpmkVJJo/big1.bin' resolves to '/path/to/.tmpmkVJJo/big1.bin' which is outside the current directory

Root Cause

The test creates temporary files using a relative path with a hidden directory prefix (.tmp*), but the path validation logic (validate_safe_file_path) rejects the resolved canonical path as "outside the current directory" due to how symlink/canonical resolution interacts with temporary directories.

Impact

• Blocks git push when the pre-push hook runs the full test suite
• Not related to any specific code change — reproducible on main

Expected Behavior

The test should either:

1. Create temp files in a way that passes path validation, or
2. Use std::env::temp_dir() with an appropriate test-only bypass for path validation