fix: refresh gitGraph config per render (7126)

[estulpz202]

📑 Summary

Ensure gitGraph respects the latest Mermaid configuration on every render.

Previously, gitGraphRenderer read the Mermaid config once at module load and cached gitGraph options. As a result, rotateCommitLabel, showBranches, and parallelCommits appeared to be ignored after the first render in interactive environments (such as the live editor) where users tweak the config without a full page reload.

This PR refreshes the gitGraph config inside draw so each render uses the latest settings.

Resolves #7126

📏 Design Decisions

• The renderer used a module-level constant which meant gitGraph options were captured once at module initialization and never updated.
• This PR changes DEFAULT_GITGRAPH_CONFIG to a mutable variable and refreshes it at the start of draw

This keeps the behavior of the first render unchanged while ensuring that subsequent renders pick up any updated gitGraph options in the Mermaid config.

• The existing error handling is preserved. If gitGraph config is missing, the renderer still throws GitGraph config not found.
• The change is intentionally minimal and scoped to the config lookup logic so it should not affect other diagram types or non-interactive usage.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
  • additional tests not required
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
  • @relturu submitted documentation pr [docs] Documentation addition for improvements to allowed characters on XY chart axis labels (Issue #7157, PR #7224) #7225
• 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

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commit: 5e96d37

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.56%. Comparing base (a3a5040) to head (5e96d37).
⚠️ Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
...kages/mermaid/src/diagrams/git/gitGraphRenderer.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7223   +/-   ##
=======================================
  Coverage     3.56%   3.56%           
=======================================
  Files          474     473    -1     
  Lines        47577   47566   -11     
  Branches       734     734           
=======================================
  Hits          1696    1696           
+ Misses       45881   45870   -11     

Flag	Coverage Δ
unit	3.56% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...kages/mermaid/src/diagrams/git/gitGraphRenderer.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Dec 7, 2025, 1:48 AM