elio 1.4.0

Snappy, batteries-included terminal file manager with rich previews, inline images, bulk actions, and trash support.
Documentation 
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## Summary

<!-- What does this PR change and why? Keep it concise. -->

## What Changed

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## User Impact

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## Notes

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## Testing

Verified with:

- [ ] `cargo fmt --check`
- [ ] `cargo test --locked --test architecture_guardrails`
- [ ] `cargo clippy --locked --all-targets -- -D warnings`
- [ ] `cargo test --locked`
- [ ] `RUSTDOCFLAGS="-D warnings" cargo doc --locked --no-deps`

Manual checks:

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- Mention OS, terminal, and any relevant tools
- Describe what you tested
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-->

Result:

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## Documentation and Changelog

- [ ] Updated docs when behavior, configuration, controls, or optional dependencies changed
- [ ] Added a `CHANGELOG.md` entry for user-visible changes
- [ ] Docs and changelog are not needed