refactor: Clippy

[mhovd]

Minor changes

[Copilot]

Pull request overview

This PR addresses Clippy lint warnings by making the code more idiomatic and concise. The changes include adding the is_empty() method to the Weights struct and simplifying loop patterns used in algorithm execution.

Changes:

• Added is_empty() method to Weights struct to complement existing len() method
• Refactored algorithm fitting loops from explicit match statements to more concise while let patterns
• Simplified return statement in fit() method by removing redundant Ok() wrapper

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/structs/weights.rs	Added is_empty() method to satisfy Clippy's len_without_is_empty lint
src/bestdose/posterior.rs	Refactored NPAG optimization loop to use while let pattern instead of explicit match
src/algorithms/mod.rs	Refactored algorithm fitting loop and simplified return statement

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[github-actions]

Bencher Report

Branch	clippy
Testbed	mhovd-pgx

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Benchmark	Latency	milliseconds (ms)
bimodal_ke_npag	📈 view plot ⚠️ NO THRESHOLD	5,076.00 ms
bimodal_ke_npod	📈 view plot ⚠️ NO THRESHOLD	1,664.50 ms
bimodal_ke_postprob	📈 view plot ⚠️ NO THRESHOLD	429.39 ms

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