feat(settings): add keyboard note range calibration

[KVKcodes]

Summary

Adds a "Calibrate" button to the "Note Range" settings section that lets users automatically configure their piano note range directly from their connected MIDI keyboard.

Problem

Setting the note range manually via the plus/minus spin buttons can be tedious, especially when using keyboards with non-standard or varying key counts (e.g., 25, 49, 61, 76, or 88 keys).

Solution

• Added a Calibrate button inside the "Note Range" section in Settings.
• When clicked, it guides the user through two steps:
  1. Step 1/2: "Play the far-left key on your keyboard..."
  2. Step 2/2: "Far-left key: . Play the far-right key..."
• Automatically detects the played notes from the connected MIDI keyboard and configures the note range. Handles both standard (left-then-right) and reversed (right-then-left) press order.
• Includes debounce protection (>=150ms) to guard against accidental chord brushes or ghost notes.
• Calibration can be cancelled at any time by clicking "Cancel" or pressing Escape.
• Added comprehensive unit tests for note formatting and calibration state transitions.

[PolyMeilex]

The app just randomly crasches during calibration.
Then it saves the broken configuration to the config file, and the app refuses to start ever again.

But the idea is quite cool, I'll take over from here and implement this with human guidance in the loop.

[PolyMeilex]

Thanks! This is very usefull.