fix the straight dbu factory in the optical bundle routing

[sebastian-goeldi]

Summary by Sourcery

Bug Fixes:

• Fixed a bug in the straight factory where the width and length were specified in DBUs instead of microns.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request modifies the optical bundle routing module by updating the straight_factory function to use a different unit conversion and adding explicit type casting for better type safety.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the _straight_factory function to use micrometer conversion instead of DBU units and added explicit type casting.	Replaced the use of c.kcl.to_dbu with c.kcl.to_um for width and length conversions. Applied a cast to the straight_factory method to ensure it conforms to the expected StraightFactoryUM type.	src/kfactory/routing/optical.py

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.94%. Comparing base (65696b7) to head (bc3dd8b).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/kfactory/routing/optical.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #604   +/-   ##
=======================================
  Coverage   65.94%   65.94%           
=======================================
  Files          64       64           
  Lines        9644     9644           
  Branches     1786     1786           
=======================================
  Hits         6360     6360           
  Misses       2761     2761           
  Partials      523      523           

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