Bug/fix gantt value valid

[Zane0816]

📑 Summary

fix gantt todayScale can be NaN

Resolves #

📏 Design Decisions

let it min with 0

📋 Tasks

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Latest commit: e5ca0fa

The changes in this PR will be included in the next version bump.

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commit: e5ca0fa

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.55%. Comparing base (2346801) to head (e5ca0fa).

Files with missing lines	Patch %	Lines
...ckages/mermaid/src/diagrams/gantt/ganttRenderer.js	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7196      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          473     474       +1     
  Lines        47500   47517      +17     
  Branches       731     731              
==========================================
  Hits          1687    1687              
- Misses       45813   45830      +17     

Flag	Coverage Δ
unit	3.55% <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
...ckages/mermaid/src/diagrams/gantt/ganttRenderer.js	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	-	Nov 25, 2025, 8:44 AM