Remove disableKeyboard and preventDefault workarounds from DatePicker

[MelvinBot]

Explanation of Change

This PR removes the disableKeyboard and event.preventDefault() workarounds from the DatePicker component, as suggested in the review on PR #79892.

Problem: PR #79892 removed readOnly from the DatePicker's TextInput (to fix the screen reader announcing "read-only" on an interactive field) and replaced it with disableKeyboard + event.preventDefault() as workarounds to prevent the cursor and keyboard from appearing.

Solution: Instead of these workarounds, this PR:

1. Modifies BaseTextInput (web + native) to skip focusing the input on press when readOnly is true. This is a sensible behavior change — a read-only input should not acquire focus when clicked via the component's press handler.

2. Updates DatePicker to:

   • Use readOnly instead of disableKeyboard (the BaseTextInput change ensures no cursor/keyboard appears)
   • Remove event.preventDefault() from handlePress (no longer needed)
   • Change role from PRESENTATION to COMBOBOX for better screen reader semantics — a combobox is the correct ARIA pattern for a field that opens a selection popup

Fixed Issues

$ #74882

Tests

1. Go to Account > Profile > Date of Birth
2. Click the date field
3. Verify the date picker modal opens
4. Verify no cursor appears in the date input field
5. Verify no keyboard appears on mobile
6. Select a date and verify it displays correctly in the field
7. Close and reopen the date picker — verify the previously selected date is highlighted

• Verify that no errors appear in the JS console

Offline tests

N/A — this is a UI interaction change with no network dependency.

QA Steps

Same as tests.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
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  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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Screenshots/Videos

Web: Chrome

Tested on web — date picker opens on click, no cursor in input, date selection works correctly, no console errors.

[melvin-bot]

Hey! I see that you made changes to our Form component. Make sure to update the docs in FORMS.md accordingly. Cheers!

[MelvinBot]

Fixed the failing Changed files ESLint check. The @typescript-eslint/no-use-before-define error was caused by isReadOnly being referenced in the onPress function before its declaration later in the component body. Moved the const isReadOnly = inputProps.readOnly ?? inputProps.disabled declaration above onPress in both index.native.tsx and index.tsx.

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
...nput/BaseTextInput/implementation/index.native.tsx	77.93% <50.00%> (ø)
...s/TextInput/BaseTextInput/implementation/index.tsx	0.00% <0.00%> (ø)
src/components/DatePicker/index.tsx	0.00% <0.00%> (ø)
... and 9 files with indirect coverage changes