Fix electrical route bundle

[sebastian-goeldi]

Fix the um-based routings. Needed for gdsfactory/gdsfactory#3653

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request refactors the route_bundle function in the electrical routing module by adding overloads for DKCell and DPort types, expanding parameter support, and adjusting type conversions. Additionally, the optical routing module has been updated to use unit conversions based on micrometers (um) instead of dbu in the straight factory function.

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

File-Level Changes

Change	Details	Files
Refactored the route_bundle function in the electrical routing module.	Added new overloads for route_bundle to support both KCell and DKCell types with corresponding port types. Expanded the function signature with additional parameters such as bend90_cell, taper_cell, min_straight_taper, place_port_type, and several boolean flags to allow more flexible routing options. Updated parameter types to use Sequence and optional types, including union types for dbu and um. Implemented conditional routing logic based on the instance type of the cell (KCell vs. DKCell) to properly handle type conversions, especially for separation and bounding box parameters.	src/kfactory/routing/electrical.py
Modified the route_bundle function in the optical routing module for unit conversion.	Updated the _straight_factory function to call the straight_factory with width and length converted via c.kcl.to_um instead of to_dbu. Applied a cast to the expected StraightFactoryUM type to ensure compatibility with the new unit conversion.	src/kfactory/routing/optical.py

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[codecov]

Codecov Report

Attention: Patch coverage is 35.38462% with 42 lines in your changes missing coverage. Please review.

Project coverage is 65.77%. Comparing base (19691f9) to head (beb1218).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/kfactory/routing/electrical.py	20.00%	31 Missing and 1 partial ⚠️
src/kfactory/routing/optical.py	53.84%	6 Missing ⚠️
src/kfactory/cross_section.py	57.14%	3 Missing ⚠️
src/kfactory/enclosure.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #605      +/-   ##
==========================================
- Coverage   65.94%   65.77%   -0.17%     
==========================================
  Files          64       64              
  Lines        9656     9693      +37     
  Branches     1787     1802      +15     
==========================================
+ Hits         6368     6376       +8     
- Misses       2762     2793      +31     
+ Partials      526      524       -2     

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