fix(er): normalize crow-foot marker alignment

[DHAWAN13]

Problem

Crow-foot markers in ER diagrams could appear misaligned across browsers and themes due to inconsistent SVG marker reference points.

Solution

Normalized marker geometry by centering refX relative to marker width, ensuring consistent attachment of crow-foot symbols to relationship edges.

Impact

• Improved cross-browser rendering consistency
• No visual redesign or breaking changes
• Affects ER diagram markers only

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9f34c5d

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commit: 9f34c5d

[codecov]

Codecov Report

❌ Patch coverage is 0% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.56%. Comparing base (7b167cf) to head (9f34c5d).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/er/erMarkers.js	0.00%	50 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7257      +/-   ##
==========================================
- Coverage     3.56%   3.56%   -0.01%     
==========================================
  Files          473     473              
  Lines        47566   47585      +19     
  Branches       734     734              
==========================================
  Hits          1696    1696              
- Misses       45870   45889      +19     

Flag	Coverage Δ
unit	3.56% <0.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/er/erMarkers.js	0.00% <0.00%> (ø)

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