palcarazm / bs-darkmode-toggle / 24192584542 / 1

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feat: add configurable ARIA labels for accessibility (#88)

Add lightAriaLabel and darkAriaLabel options with defaults
"Switch to dark mode" and "Switch to light mode". These labels
dynamically update when theme changes to describe the action that
will be performed.

- Add lightAriaLabel and darkAriaLabel to DarkModeOptions and
  ResolvedOptions
- Update OptionResolver to read from data-light-aria-label and
  data-dark-aria-label attributes
- Implement getAriaLabel() in AbstractLayout for centralized
  label resolution
- Update ButtonLayout to set aria-label on state change
- Update ToggleLayout to set aria-label and call rerender only
  when label changes (performance optimization)
- Add unit tests for ARIA label resolution and dynamic updates
- Add documentation with custom ARIA label feature example

Implements #65

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