Refactor: Fix clippy::unnecessary-map-or warning

[insign]

This PR fixes a warning reported by clippy by refactoring an Option::map_or(false, ...) call to Option::is_some_and(...) in src/main.rs. Also formatted the codebase using cargo fmt as required. This provides a small but solid improvement to the code quality. All make precommit checks passed.

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PR created automatically by Jules for task 4734498811516374309 started by @insign

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