refactor(tree, rustfmt): move private function below and set max_width to 119

[himkt]

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[Copilot]

Pull request overview

This PR reorganizes the SegmentTree implementation by moving a private helper function to the end of the impl block, and configures rustfmt with a max_width of 119 characters. The formatting change is then applied consistently across multiple files to collapse multi-line struct initializations and assertions into single lines.

• Moved range_query_recursive helper function to the end of the SegmentTree impl block for better organization
• Added rustfmt.toml configuration with max_width = 119
• Applied automatic formatting to collapse multi-line expressions across the codebase

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/tree.rs	Relocated private range_query_recursive function to the end of the impl block
src/math.rs	Collapsed multi-line struct initialization for SequentialPrimeFactorization
src/graph.rs	Collapsed multi-line assertions, struct initializations, and test vectors
src/geometry.rs	Collapsed multi-line iterator chain in convex_hull function
src/collection.rs	Collapsed multi-line struct initialization for Bitset
rustfmt.toml	Added rustfmt configuration file with max line width setting

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