[JavithNaseem-J]

Problem

When two supplementary files have the same path but different contents, the AASX writer logs an error in failsafe mode but still writes the conflicting file.

This creates duplicate ZIP entries and can cause the original file contents to be lost when reading the package.

Fix

Add continue after logging the conflict in failsafe mode so the writer skips the duplicate supplementary file.

Strict mode continues to raise ValueError for conflicting files.

Testing

• Added a regression test for conflicting supplementary files.
• Verified the regression test fails before the fix and passes afterward.
• Verified that the original file content is preserved.
• Verified that strict mode raises ValueError.

Fixes #671

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