feat: textarea/Datepicker updates

[Ricardo-Tele]

• Implements hide-label-visually for scale-date-picker and scale-textarea to visually hide labels while keeping them accessible for screen readers.
• Update of the original “Hidden Label Visually” implementation.

[Copilot]

Pull request overview

This PR adds hideLabel / hide-label prop support to scale-textarea and scale-date-picker components, allowing labels to be visually hidden while remaining accessible to screen readers. Unlike the existing hideLabelVisually implementation in scale-text-field, scale-dropdown, and scale-dropdown-select (which uses visibility: hidden), this implementation uses the standard "visually hidden" sr-only CSS technique, which is more accessible.

Changes:

• New hideLabel prop and CSS rule on scale-textarea to visually hide the label via the sr-only pattern
• New hideLabel prop and CSS rule on scale-date-picker to visually hide the label via the sr-only pattern
• New/updated HTML demo files and unit/e2e tests for both components

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
packages/components/src/components/textarea/textarea.tsx	Adds hideLabel prop and wires it to the CSS class map
packages/components/src/components/textarea/textarea.css	Adds .textarea--hide-label .textarea__label sr-only CSS rule
packages/components/src/components/textarea/textarea.spec.ts	Adds snapshot and prop-check tests for hideLabel
packages/components/src/components/textarea/textarea.e2e.ts	Adds E2E tests for the textarea--hide-label class
packages/components/src/components/date-picker/date-picker.tsx	Adds hideLabel prop and wires it to the CSS class map
packages/components/src/components/date-picker/date-picker.css	Adds .scale-date-picker--hide-label .date-picker__label sr-only CSS rule
packages/components/src/html/textarea.html	New HTML demo file showing the hidden-label textarea example
packages/components/src/html/date-picker.html	Extends existing demo with a hidden-label date-picker example

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[Copilot]

The prop is named hideLabel (HTML attribute: hide-label), but the equivalent prop in the existing scale-dropdown, scale-dropdown-select, and scale-text-field components is named hideLabelVisually (HTML attribute: hide-label-visually). This inconsistency in the public API makes it harder for consumers who use multiple form components to predict the correct attribute name. The prop should be renamed to hideLabelVisually to align with the established convention across the codebase.

[amir-ba]

Please apply the suggestions from copilot and run linter and formatter to fix the pipeline failure.