[WIP] Identify and fix issues in Arduino clapper switch code

[Copilot]

• Create Arduino/ClapperSwitch/ClapperSwitch.ino with improved clapper switch implementation
  • Replace blocking delay() with non-blocking millis()-based timing
  • Implement a proper state machine for double-clap detection
  • Add output toggle logic (on/off with each double-clap)
  • Add configurable timing constants (clap window, debounce interval)
  • Add clear, descriptive comments

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