Feat: Add editor popup modal

[rajat-ht]

📑 Summary

This PR contains adds Editor popup modal.

📏 Design Decisions

Design decisions made by the Mermaid Chart team.

📋 Tasks

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• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
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Latest commit: ef449a6

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 143 lines in your changes missing coverage. Please review.

Project coverage is 3.84%. Comparing base (f23a26e) to head (ef449a6).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
...ocs/.vitepress/components/EditorSelectionModal.vue	0.00%	138 Missing ⚠️
...ackages/mermaid/src/docs/.vitepress/theme/index.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #6609      +/-   ##
=========================================
- Coverage    3.84%   3.84%   -0.01%     
=========================================
  Files         413     414       +1     
  Lines       43399   43407       +8     
  Branches      666     666              
=========================================
  Hits         1670    1670              
- Misses      41729   41737       +8     

Flag	Coverage Δ
unit	3.84% <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
...ackages/mermaid/src/docs/.vitepress/theme/index.ts	2.38% <0.00%> (ø)
...ocs/.vitepress/components/EditorSelectionModal.vue	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	-	May 28, 2025, 4:37 PM

[sidharthv96]

Instead of using index here, use a boolean flag in the column object, like highlighted: true.
Remove all the use of index.

[rajat-ht]

Updated in 5fe0f53