Reapply imeHintLocales on text change to prevent IME override mid-session.

[Alok-Silswal]

Purpose / Description

When a field has a configured imeHintLocales, the IME may override it mid-session after learning from typed characters (e.g., switching from Arabic to English).
As a result, the keyboard no longer respects the configured hint for that field.

This PR ensures that the configured imeHintLocales continues to be respected while typing.

Fixes

• Fixes Set keyboard language hint breaks if you type in a language other than the hint language #19839

Approach

A TextWatcher was added to the type-answer EditText in setupTypeAnswer().

Inside afterTextChanged, InputMethodManager.restartInput() is invoked.
This reinitializes the input connection and causes the IME to re-read the configured imeHintLocales on text change.

In testing, this prevents the IME from persisting the overridden language mid-session.

How Has This Been Tested?

Test Setup:

• Android Emulator ( Pixel 6 API 33)
• Gboard

Steps:

• Set imeHintLocales of a field to Arabic.
• Start typing in the field (Arabic layout shown).
• Manually switch keyboard to English.
• Type in English.
• Click on 'Back' and come again on 'Front' field.

Observed:

• The keyboard automatically switches back to Arabic even though we typed in English earlier.
• No visible flicker.
• No keyboard dismissal.
• No composition reset.
• No typing lag.

Video is attached as evidence.

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

Keyboard.hint.resolve.evidence.mp4