Implement Keyboard Mapping for 4 Octaves Using All Keyboard Rows

[baync180705]

Description:

After displaying 4 octaves on-screen (Issue #2 ), the next step is to map each octave to a specific keyboard row on the physical keyboard.
This allows the user to play all 4 octaves using their computer keyboard.

Each row will correspond to one octave as follows:

Keyboard Row	Octave
Number row (1–0)	Octave 7
QWERTY row	Octave 6
ASDF row	Octave 5
ZXCV row	Octave 4

Tasks:

• Update event handling logic to detect keypresses from all 4 rows.
• Map keys to their corresponding musical notes and octaves.
• Ensure proper handling of simultaneous key presses.
• Keep the octave range in sync with the dropdown setting.
• Test and verify that sounds play correctly for all octaves.

Expected Outcome:

• All 4 octaves playable simultaneously via keyboard.
• Smooth key-to-note mapping without overlap or lag.
• Works seamlessly with the updated octave range UI.