Stabilize passcode keypad digit rendering in shared auth keypad

[Copilot]

The login passcode keypad could intermittently render with a missing digit, leaving the keypad visible but incomplete on first paint. This change targets the shared keypad component used across authentication flows so all numeric keys render consistently.

• Keypad rendering

  • Replaced the digit label in KeyPadButton with native React Native Text instead of the shared text wrapper.
  • Kept the existing keypad layout, press behavior, and bubble effect intact.
  • Preserved the shared component API so existing callers do not need to change.

• Regression coverage

  • Added a focused keypad component test that asserts digits 0 through 9 are rendered.
  • Verified the shared keypad still emits numeric key presses and delete actions.

• Spec update

  • Added and archived the OpenSpec requirement for shared passcode keypad rendering so the expected behavior is explicit going forward.

<NativeText allowFontScaling={false} style={[styles.keyPadElementText, { color: keyColor }]}>
  {title}
</NativeText>

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