Fix eslint error @typescript-eslint/no-base-to-string in common.ts

[Shahir-47]

📑 Summary

This PR fixes the eslint error @typescript-eslint/no-base-to-string caused by the use of .toString() in the file /packages/mermaid/src/diagrams/common/common.ts on line 86. The error prevented pnpm test from running successfully. The issue is resolved by explicitly converting the sanitized text to a string using the String() method.

Resolves #6113

📏 Design Decisions

• Replaced the .toString() method with String() to explicitly convert the result of DOMPurify.sanitize to a string, adhering to the eslint rule @typescript-eslint/no-base-to-string.
• This ensures that the object is safely converted without relying on the default stringification format ([object Object]), which was causing the issue.
• No functionality changes were introduced; the fix only resolves the linting error.

📋 Tasks

Make sure you

• 📖 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.
• 🦋 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: 3ee2598

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 4.48%. Comparing base (df636c6) to head (3ee2598).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/common/common.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6115   +/-   ##
=======================================
  Coverage     4.48%   4.48%           
=======================================
  Files          383     383           
  Lines        54038   54038           
  Branches       596     596           
=======================================
  Hits          2425    2425           
  Misses       51613   51613           

Flag	Coverage Δ
unit	4.48% <0.00%> (ø)

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

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/common/common.ts	53.01% <0.00%> (ø)

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