fix(vue/no-duplicate-class-names): improve non-intersecting conditions and combining parents

[Yizack]

This PR fixes #2974 and adds its respective test case

Also added additional tests for edge cases with combining parents including:

• Non-intersecting conditions with nested objects
• Binary expressions within logical expressions
• Template literals within logical expressions

[changeset-bot]

🦋 Changeset detected

Latest commit: 791d65e

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

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-vue	Patch

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[FloEdelmann]

Nice, thank you for the quick fix! 🙂

[Copilot]

Pull request overview

This PR fixes issue #2974 by improving duplicate class name detection in the vue/no-duplicate-class-names rule. The fix addresses false positives when class names appear in non-intersecting conditional expressions, while correctly detecting duplicates within combining expressions (BinaryExpression and TemplateLiteral).

Key Changes:

• Added parentExpr parameter tracking to identify the parent expression context for each class name
• Modified LogicalExpression handling to mark the right side as always conditional (unconditional=false)
• Enhanced duplicate detection logic to consider class names in different LogicalExpressions as non-intersecting (not duplicates) unless one is unconditional or they share the same combining parent

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/rules/no-duplicate-class-names.js	Implements parent expression tracking throughout extractClassNodes function and updates duplicate detection logic to distinguish between non-intersecting conditions and combining expressions
tests/lib/rules/no-duplicate-class-names.js	Adds comprehensive test coverage for non-intersecting conditions (nested objects, multiple logical expressions, binary in logical) and duplicate detection in combining expressions (binary and template literals within logical expressions)
.changeset/major-planes-fly.md	Documents the patch fix for false positives in non-intersecting conditions and improved duplicate detection in combining expressions

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[FloEdelmann]

I'll merge this and release another patch version, but feel free to review this after merging @ota-meshi and @waynzh!