Fix tidy-viewer-py build error

[alexhallam]

Align package versions and include Rust source files in the Python distribution to fix build failures during installation.

The package failed to build during installation because maturin could not find the Cargo.toml for tidy-viewer-core. This was due to tidy-viewer-py having a relative path dependency on tidy-viewer-core within a monorepo structure, which breaks when the Python package is built in isolation. The MANIFEST.in file ensures the necessary Rust source files are included in the distributed package, allowing maturin to find them. Additionally, version inconsistencies and an incorrect maturin dependency were resolved.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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