fix(numberfield): preserve validation errors on blur when value unchanged

[kaigritun]

Description

When a NumberField has validation errors (e.g., from Form validationErrors prop), focusing and then blurring the field without changing its value would incorrectly reset the validation state, removing the data-invalid attribute.

Changes

In useNumberField.ts, the onBlur handler now checks if the input value has actually changed from the state's inputValue before calling commitAndAnnounce(). This prevents commit() from being called (and thus commitValidation() from resetting the validation state) when the user simply focuses and blurs without editing.

Reproduction

From issue #9444:

<Form validationErrors={{testNumber: 'foo-bar error!'}}>
  <NumberField name="testNumber">
    <Label>Test Number</Label>
    <Input />
    <FieldError />
  </NumberField>
  <Button type="submit" />
</Form>

1. Type something in the number field (e.g., "1") and submit
2. See the error appear
3. Focus the number field
4. Blur the number field (without changing the value)
5. Before fix: Error disappears
6. After fix: Error remains displayed

Testing

Added a test case that verifies validation errors are preserved when focusing and blurring without changing the value.

All existing NumberField tests pass.

Fixes #9444

[snowystinger]

Awesome, thanks for the PR so quickly and for the test!

doh, spoke too fast, it's failing tests :(

[snowystinger]

Probably need to track the previous input value from the last commit, or increment/decrement instead of inputValue, since by the time the user blurs the inputValue will always be the inputRef's current value