fix: replace deprecated String.Prototype.substr with slice #2050
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What kind of change does this PR introduce?
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If relevant, did you update the documentation?
Summary
This PR replaces usages of the deprecated
String.prototype.substrAPI with standard and well-supported alternatives (sliceorsubstring) in the affected areas.The deprecated usage was causing ESLint/editor warnings. The changes preserve existing behavior and logic while aligning with modern JavaScript best practices.
Does this PR introduce a breaking change?
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