fix: Update the clusterDb assignment from plain objects to Map in v11.12.0

[abroa01]

Resolves #7006

render() immediately fails with TypeError: id of clusterDb.keys is not a function
Root Cause: Major regression introduced in Mermaid v11.0.0 where clusterDb objects are created as plain objects instead of Map instances, causing .keys() method to be undefined

Change :
Change the clusterDb assignment from plain objects to Map in a for loop

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commit: 0d42b6b

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❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 3.55%. Comparing base (fed8a52) to head (0d42b6b).
⚠️ Report is 39 commits behind head on develop.

Files with missing lines	Patch %	Lines
...g-util/layout-algorithms/dagre/mermaid-graphlib.js	0.00%	1 Missing ⚠️

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@@            Coverage Diff             @@
##           develop   #7104      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          473     474       +1     
  Lines        47480   47491      +11     
  Branches       730     730              
==========================================
  Hits          1687    1687              
- Misses       45793   45804      +11     

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	1 changed	Oct 24, 2025, 5:12 PM

[sidharthv96]

@abroa01 can you add a unit test for this scenario as well?

[sidharthv96]

This fix does not solve the root cause. Inside the for loop, clusterDb.get is called, which will fail.

This particular instance of clusterDb is created as a Map, so I don't understand why it's failing in Cordova.

https://github.com/abroa01/mermaid/blob/0d42b6b34bcd6f91f5d7f993adec3848ce84a600/packages/mermaid/src/rendering-util/layout-algorithms/dagre/mermaid-graphlib.js#L6-L7