BUG: Mermaid nodes with spaces in name

[williambdean]

Description

Example: plant growth will become plant_growth for the node name but will still be displayed as "plant growth"

Related Issue

• Closes BUG: pm.model_to_mermaid with spaces in variable names #7829
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

---

📚 Documentation preview 📚: https://pymc--7835.org.readthedocs.build/en/7835/

[williambdean]

Example rendering :

import pymc as pm

with pm.Model() as model: 
    mu = pm.Normal("plant growth mu")
    sigma = pm.HalfNormal("plant growth sigma")
    pm.Normal("plant growth", mu=mu, sigma=sigma)

print(pm.model_to_mermaid(model))

graph TD
%% Nodes:
plant_growth([plant growth ~ Normal])
plant_growth@{ shape: rounded }
plant_growth_mu([plant growth mu ~ Normal])
plant_growth_mu@{ shape: rounded }
plant_growth_sigma([plant growth sigma ~ HalfNormal])
plant_growth_sigma@{ shape: rounded }

%% Edges:
plant_growth_mu --> plant_growth
plant_growth_sigma --> plant_growth

%% Plates:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.91%. Comparing base (4271195) to head (a7bbe34).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7835      +/-   ##
==========================================
+ Coverage   91.58%   92.91%   +1.33%     
==========================================
  Files         107      107              
  Lines       18282    18286       +4     
==========================================
+ Hits        16744    16991     +247     
+ Misses       1538     1295     -243     

Files with missing lines	Coverage Δ
pymc/model_graph.py	85.07% <100.00%> (+0.19%)	⬆️

... and 3 files with indirect coverage changes

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