feat: support hardware keys in numpad

[ovitrif]

Description

This PR adds hardware keyboard support to the custom NumberPad composable, enabling digit keys (0-9), backspace, delete, and period to trigger the same input callbacks as touch. Useful when running in emulator or with a phone connected via Android Studio.

The change is scoped to the primary NumberPad composable only, so all 15+ screens using it (PIN entry, amount input, fee input, etc.) get keyboard support automatically.

Preview

keypad_1.5x.mp4

QA Notes

1. Emulator keyboard input

• Open any screen with a numpad (e.g. Send > Amount, or PIN entry)
• Type digits 0-9 using the computer keyboard
• Verify digits appear as if tapping the on-screen numpad
• Press Backspace or Delete to remove last digit
• Verify both work identically to the on-screen delete button

2. Decimal key filtering

• Open Send > Amount screen (uses DECIMAL numpad type)
• Press the period key on the keyboard
• Verify the decimal point is entered
• Open a PIN entry screen (uses SIMPLE numpad type)
• Press the period key
• Verify nothing happens (period is ignored)

3. Touch input still works

• On any numpad screen, verify tapping on-screen buttons still works as before alongside keyboard input

4. NumPad keys (extended keyboard)

• If using an extended keyboard, verify NumPad 0-9 and NumPad dot also work

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[jvsena42]

nice!