fix(input, textarea): ensure screen readers announce helper and error text when focused

[thetaPC]

Issue number: internal

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What is the current behavior?

Screen readers do not announce helper and error text when user is focused on the input or textarea. This does not align with the accessibility guidelines.

What is the new behavior?

• The appropriate aria tags are added to the native input and textarea in order to associate them to the helper and error texts.
• aria-describedBy will only be added to the native element based on helper or error text. If helper text exists then the helper text ID will be used. If the error text exists and the component has the ion-touched ion-invalid classes, then the error text ID will be used.
• aria-invalid will only be added if the error text exists and the component has the ion-touched ion-invalid classes.
• Added tests.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

How to test:

1. Navigate to the input page on the main branch
2. Turn on the screen reader of your choice
3. Notice that the screen reader does not announce the helper or error text when the input is focused
4. Navigate to the input page on the ROU-11274 branch
5. Turn on the screen reader of your choice
6. Verify that the screen reader announces the helper or error text when the input is focused on
7. Navigate to the textarea page on the main branch
8. Repeat steps 2-3
9. Navigate to the textarea page on the ROU-11274 branch
10. Repeat steps 5-6

Known Webkit issues: This fix will not work on macOS 16 and 17 as VoiceOver will not read any text using aria-describedby. Works fine on macOS 18.

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