fix: warn when implicit label has no visible text

[ShivaniNR]

Short description of what this resolves

Closes #1860

An implicit label wrapping an input (<label><input /></label>) without any visible text is inaccessible; screen readers find the input but have no name to announce. After #1852 added implicit label support, this case was silently accepted.

Proposed changes

• Added a labelHasText flag that resets when an implicit <label> opens
• Added a text event listener that sets the flag when non-whitespace text is found inside the label
• On </label> close, if no text was found, nested inputs are marked as unlabeled, so the existing warning fires
• Updated tests: empty/whitespace-only labels now warn, labels with visible text pass

[gemini-code-assist]

Code Review

This pull request updates the input-requires-label rule to ensure that labels with nested inputs contain descriptive, non-whitespace text. While the changes introduce a text listener and updated tests, a logic bug was identified where the use of a single boolean flag incorrectly tracks text presence across multiple or nested labels. The reviewer provides actionable feedback and code suggestions to replace this logic with a state stack, ensuring correct validation for each label's scope.

[Copilot]

Pull request overview

Updates the input-requires-label rule to warn when an implicit <label> (wrapping an <input>) contains no non-whitespace text, closing an accessibility gap introduced when implicit-label support was added in #1852.

Changes:

• Track per-implicit-label state (text presence + input range) and mark wrapped inputs as unlabeled when the label has no text.
• Listen to parser text events to detect non-whitespace label content (including within child elements).
• Expand test coverage for empty/whitespace-only implicit labels and multi-label/nested-label regressions.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test/rules/input-requires-label.spec.js	Updates/extends specs to cover implicit labels with/without visible text.
src/core/rules/input-requires-label.ts	Adds label state stack + text listener to detect empty implicit labels and trigger existing warnings.
dist/core/rules/input-requires-label.js	Compiled output reflecting the TypeScript rule changes.

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[coliff]

PR looking really good. thanks for your work on this! Just one comment left from Copilot to review I think.

[ShivaniNR]

PR looking really good. thanks for your work on this! Just one comment left from Copilot to review I think.

Thanks! Moved the two tests to the Error cases block as Copilot suggested.